/*----------------------------------------------------------------------------/
   /  FatFs - FAT file system module  R0.08a                 (C)ChaN, 2010
   /-----------------------------------------------------------------------------/
   / FatFs module is a generic FAT file system module for small embedded systems.
   / This is a free software that opened for education, research and commercial
   / developments under license policy of following terms.
   /
   /  Copyright (C) 2010, ChaN, all right reserved.
   /
   / * The FatFs module is a free software and there is NO WARRANTY.
   / * No restriction on use. You can use, modify and redistribute it for
   /   personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
   / * Redistributions of source code must retain the above copyright notice.
   /
   /-----------------------------------------------------------------------------/
   / Feb 26,'06 R0.00  Prototype.
   /
   / Apr 29,'06 R0.01  First stable version.
   /
   / Jun 01,'06 R0.02  Added FAT12 support.
   /                   Removed unbuffered mode.
   /                   Fixed a problem on small (<32M) partition.
   / Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM).
   /
   / Sep 22,'06 R0.03  Added f_rename().
   /                   Changed option _FS_MINIMUM to _FS_MINIMIZE.
   / Dec 11,'06 R0.03a Improved cluster scan algorithm to write files fast.
   /                   Fixed f_mkdir() creates incorrect directory on FAT32.
   /
   / Feb 04,'07 R0.04  Supported multiple drive system.
   /                   Changed some interfaces for multiple drive system.
   /                   Changed f_mountdrv() to f_mount().
   /                   Added f_mkfs().
   / Apr 01,'07 R0.04a Supported multiple partitions on a physical drive.
   /                   Added a capability of extending file size to f_lseek().
   /                   Added minimization level 3.
   /                   Fixed an endian sensitive code in f_mkfs().
   / May 05,'07 R0.04b Added a configuration option _USE_NTFLAG.
   /                   Added FSInfo support.
   /                   Fixed DBCS name can result FR_INVALID_NAME.
   /                   Fixed short seek (<= csize) collapses the file object.
   /
   / Aug 25,'07 R0.05  Changed arguments of f_read(), f_write() and f_mkfs().
   /                   Fixed f_mkfs() on FAT32 creates incorrect FSInfo.
   /                   Fixed f_mkdir() on FAT32 creates incorrect directory.
   / Feb 03,'08 R0.05a Added f_truncate() and f_utime().
   /                   Fixed off by one error at FAT sub-type determination.
   /                   Fixed btr in f_read() can be mistruncated.
   /                   Fixed cached sector is not flushed when create and close without write.
   /
   / Apr 01,'08 R0.06  Added fputc(), fputs(), fprintf() and fgets().
   /                   Improved performance of f_lseek() on moving to the same or following cluster.
   /
   / Apr 01,'09 R0.07  Merged Tiny-FatFs as a buffer configuration option. (_FS_TINY)
   /                   Added long file name support.
   /                   Added multiple code page support.
   /                   Added re-entrancy for multitask operation.
   /                   Added auto cluster size selection to f_mkfs().
   /                   Added rewind option to f_readdir().
   /                   Changed result code of critical errors.
   /                   Renamed string functions to avoid name collision.
   / Apr 14,'09 R0.07a Separated out OS dependent code on reentrant cfg.
   /                   Added multiple sector size support.
   / Jun 21,'09 R0.07c Fixed f_unlink() can return FR_OK on error.
   /                   Fixed wrong cache control in f_lseek().
   /                   Added relative path feature.
   /                   Added f_chdir() and f_chdrive().
   /                   Added proper case conversion to extended char.
   / Nov 03,'09 R0.07e Separated out configuration options from ff.h to ffconf.h.
   /                   Fixed f_unlink() fails to remove a sub-dir on _FS_RPATH.
   /                   Fixed name matching error on the 13 char boundary.
   /                   Added a configuration option, _LFN_UNICODE.
   /                   Changed f_readdir() to return the SFN with always upper case on non-LFN cfg.
   /
   / May 15,'10 R0.08  Added a memory configuration option. (_USE_LFN = 3)
   /                   Added file lock feature. (_FS_SHARE)
   /                   Added fast seek feature. (_USE_FASTSEEK)
   /                   Changed some types on the API, XCHAR->TCHAR.
   /                   Changed fname member in the FILINFO structure on Unicode cfg.
   /                   String functions support UTF-8 encoding files on Unicode cfg.
   / Aug 16,'10 R0.08a Added f_getcwd(). (_FS_RPATH = 2)
   /                   Added sector erase feature. (_USE_ERASE)
   /                   Moved file lock semaphore table from fs object to the bss.
   /                   Fixed a wrong directory entry is created on non-LFN cfg when the given name contains ';'.
   /                   Fixed f_mkfs() creates wrong FAT32 volume.
   /---------------------------------------------------------------------------*/

#include "ff.h"         /* FatFs configurations and declarations */
#include "diskio.h"     /* Declarations of low level disk I/O functions */


/*--------------------------------------------------------------------------

   Module Private Definitions

   ---------------------------------------------------------------------------*/

#if _FATFS != 8255
#error Wrong include file (ff.h).
#endif


/* Definitions on sector size */
#if _MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096
#error Wrong sector size.
#endif
#if _MAX_SS != 512
#define SS(fs)  ((fs)->ssize)   /* Multiple sector size */
#else
#define SS(fs)  512U            /* Fixed sector size */
#endif


/* Reentrancy related */
#if _FS_REENTRANT
#if _USE_LFN == 1
#error Static LFN work area must not be used in re-entrant configuration.
#endif
#define ENTER_FF(fs)        { if (!lock_fs(fs)) { return FR_TIMEOUT; } }
#define LEAVE_FF(fs, res)   { unlock_fs(fs, res); return res; }
#else
#define ENTER_FF(fs)
#define LEAVE_FF(fs, res)   return res
#endif

#define ABORT(fs, res)      { fp->flag |= FA__ERROR; LEAVE_FF(fs, res); }


/* File shareing feature */
#if _FS_SHARE
#if _FS_READONLY
#error _FS_SHARE must be 0 on read-only cfg.
#endif
typedef struct
{
    FATFS *fs;              /* File ID 1, volume (NULL:blank entry) */
    DWORD clu;              /* File ID 2, directory */
    WORD idx;               /* File ID 3, directory index */
    WORD ctr;               /* File open counter, 0:none, 0x01..0xFF:read open count, 0x100:write mode */
} FILESEM;
#endif


/* Misc definitions */
#define LD_CLUST(dir)   (((DWORD)LD_WORD(dir + DIR_FstClusHI) << 16) | LD_WORD(dir + DIR_FstClusLO))
#define ST_CLUST(dir, cl) { ST_WORD(dir + DIR_FstClusLO, cl); ST_WORD(dir + DIR_FstClusHI, (DWORD)cl >> 16); }


/* Character code support macros */
#define IsUpper(c)  (((c) >= 'A') && ((c) <= 'Z'))
#define IsLower(c)  (((c) >= 'a') && ((c) <= 'z'))
#define IsDigit(c)  (((c) >= '0') && ((c) <= '9'))

#if _DF1S       /* Code page is DBCS */

#ifdef _DF2S    /* Two 1st byte areas */
#define IsDBCS1(c)  (((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E) || ((BYTE)(c) >= _DF2S && (BYTE)(c) <= _DF2E))
#else           /* One 1st byte area */
#define IsDBCS1(c)  ((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E)
#endif

#ifdef _DS3S    /* Three 2nd byte areas */
#define IsDBCS2(c)  (((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E) || ((BYTE)(c) >= _DS3S && (BYTE)(c) <= _DS3E))
#else           /* Two 2nd byte areas */
#define IsDBCS2(c)  (((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E))
#endif

#else           /* Code page is SBCS */

#define IsDBCS1(c)  0
#define IsDBCS2(c)  0

#endif /* _DF1S */


/* Name status flags */
#define NS          11      /* Offset of name status byte */
#define NS_LOSS     0x01    /* Out of 8.3 format */
#define NS_LFN      0x02    /* Force to create LFN entry */
#define NS_LAST     0x04    /* Last segment */
#define NS_BODY     0x08    /* Lower case flag (body) */
#define NS_EXT      0x10    /* Lower case flag (ext) */
#define NS_DOT      0x20    /* Dot entry */


/* FAT sub-type boundaries */
/* Note that the FAT spec by Microsoft says 4085 but Windows works with 4087! */
#define MIN_FAT16   4086    /* Minimum number of clusters for FAT16 */
#define MIN_FAT32   65526   /* Minimum number of clusters for FAT32 */


/* FatFs refers the members in the FAT structures as byte array instead of
   / structure member because there are incompatibility of the packing option
   / between compilers. */

#define BS_jmpBoot          0
#define BS_OEMName          3
#define BPB_BytsPerSec      11
#define BPB_SecPerClus      13
#define BPB_RsvdSecCnt      14
#define BPB_NumFATs         16
#define BPB_RootEntCnt      17
#define BPB_TotSec16        19
#define BPB_Media           21
#define BPB_FATSz16         22
#define BPB_SecPerTrk       24
#define BPB_NumHeads        26
#define BPB_HiddSec         28
#define BPB_TotSec32        32
#define BS_DrvNum           36
#define BS_BootSig          38
#define BS_VolID            39
#define BS_VolLab           43
#define BS_FilSysType       54
#define BPB_FATSz32         36
#define BPB_ExtFlags        40
#define BPB_FSVer           42
#define BPB_RootClus        44
#define BPB_FSInfo          48
#define BPB_BkBootSec       50
#define BS_DrvNum32         64
#define BS_BootSig32        66
#define BS_VolID32          67
#define BS_VolLab32         71
#define BS_FilSysType32     82
#define FSI_LeadSig         0
#define FSI_StrucSig        484
#define FSI_Free_Count      488
#define FSI_Nxt_Free        492
#define MBR_Table           446
#define BS_55AA             510

#define DIR_Name            0
#define DIR_Attr            11
#define DIR_NTres           12
#define DIR_CrtTime         14
#define DIR_CrtDate         16
#define DIR_FstClusHI       20
#define DIR_WrtTime         22
#define DIR_WrtDate         24
#define DIR_FstClusLO       26
#define DIR_FileSize        28
#define LDIR_Ord            0
#define LDIR_Attr           11
#define LDIR_Type           12
#define LDIR_Chksum         13
#define LDIR_FstClusLO      26



/*------------------------------------------------------------*/
/* Work area                                                  */

#if _VOLUMES
static
FATFS *FatFs[_VOLUMES]; /* Pointer to the file system objects (logical drives) */
#else
#error Number of drives must not be 0.
#endif

static
WORD Fsid;              /* File system mount ID */

#if _FS_RPATH
static
BYTE CurrVol;           /* Current drive */
#endif

#if _FS_SHARE
static
FILESEM Files[_FS_SHARE];   /* File lock semaphores */
#endif

#if _USE_LFN == 0           /* No LFN */
#define DEF_NAMEBUF         BYTE sfn[12]
#define INIT_BUF(dobj)      (dobj).fn = sfn
#define FREE_BUF()

#elif _USE_LFN == 1         /* LFN with static LFN working buffer */
static WCHAR LfnBuf[_MAX_LFN + 1];
#define DEF_NAMEBUF         BYTE sfn[12]
#define INIT_BUF(dobj)      { (dobj).fn = sfn; (dobj).lfn = LfnBuf; }
#define FREE_BUF()

#elif _USE_LFN == 2         /* LFN with dynamic LFN working buffer on the stack */
#define DEF_NAMEBUF         BYTE sfn[12]; WCHAR lbuf[_MAX_LFN + 1]
#define INIT_BUF(dobj)      { (dobj).fn = sfn; (dobj).lfn = lbuf; }
#define FREE_BUF()

#elif _USE_LFN == 3         /* LFN with dynamic LFN working buffer on the heap */
#define DEF_NAMEBUF         BYTE sfn[12]; WCHAR *lfn
#define INIT_BUF(dobj)      { lfn = ff_memalloc((_MAX_LFN + 1) * 2); \
                              if (!lfn) { LEAVE_FF((dobj).fs, FR_NOT_ENOUGH_CORE); } \
                              (dobj).lfn = lfn; (dobj).fn = sfn; }
#define FREE_BUF()          ff_memfree(lfn)

#else
#error Wrong LFN configuration.
#endif




/*--------------------------------------------------------------------------

   Module Private Functions

   ---------------------------------------------------------------------------*/


/*-----------------------------------------------------------------------*/
/* String functions                                                      */
/*-----------------------------------------------------------------------*/

/* Copy memory to memory */
static
void mem_cpy(void* dst, const void* src, UINT cnt)
{
    BYTE *d = (BYTE*)dst;
    const BYTE *s = (const BYTE*)src;

#if _WORD_ACCESS == 1
    while (cnt >= sizeof(int))
    {
        *(int*)d = *(int*)s;
        d += sizeof(int); s += sizeof(int);
        cnt -= sizeof(int);
    }
#endif
    while (cnt--)
    {
        *d++ = *s++;
    }
}

/* Fill memory */
static
void mem_set(void* dst, int val, UINT cnt)
{
    BYTE *d = (BYTE*)dst;

    while (cnt--)
    {
        *d++ = (BYTE)val;
    }
}

/* Compare memory to memory */
static
int mem_cmp(const void* dst, const void* src, UINT cnt)
{
    const BYTE *d = (const BYTE*)dst, *s = (const BYTE*)src;
    int r = 0;

    while (cnt-- && (r = *d++ - *s++) == 0)
    {
        ;
    }
    return r;
}

/* Check if chr is contained in the string */
static
int chk_chr(const char* str, int chr)
{
    while (*str && *str != chr)
    {
        str++;
    }
    return *str;
}



/*-----------------------------------------------------------------------*/
/* Request/Release grant to access the volume                            */
/*-----------------------------------------------------------------------*/
#if _FS_REENTRANT

static
int lock_fs(
    FATFS *fs       /* File system object */
    )
{
    return ff_req_grant(fs->sobj);
}


static
void unlock_fs(
    FATFS *fs,      /* File system object */
    FRESULT res     /* Result code to be returned */
    )
{
    if (res != FR_NOT_ENABLED &&
        res != FR_INVALID_DRIVE &&
        res != FR_INVALID_OBJECT &&
        res != FR_TIMEOUT)
    {
        ff_rel_grant(fs->sobj);
    }
}
#endif



/*-----------------------------------------------------------------------*/
/* File shareing control functions                                       */
/*-----------------------------------------------------------------------*/
#if _FS_SHARE

static
FRESULT chk_lock(   /* Check if the file can be accessed */
    DIR* dj,        /* Directory object pointing the file to be checked */
    int acc         /* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
    )
{
    UINT i, be;

    /* Search file semaphore table */
    for (i = be = 0; i < _FS_SHARE; i++)
    {
        if (Files[i].fs)    /* Existing entry */
        {
            if (Files[i].fs == dj->fs &&        /* Check if the file matched with an open file */
                Files[i].clu == dj->sclust &&
                Files[i].idx == dj->index)
            {
                break;
            }
        }
        else                /* Blank entry */
        {
            be++;
        }
    }
    if (i == _FS_SHARE) /* The file is not opened */
    {
        return (be || acc == 2) ? FR_OK : FR_TOO_MANY_OPEN_FILES;   /* Is there a blank entry for new file? */

    }
    /* The file has been opened. Reject any open against writing file and all write mode open */
    return (acc || Files[i].ctr == 0x100) ? FR_LOCKED : FR_OK;
}


static
int enq_lock(   /* Check if an entry is available for a new file */
    FATFS* fs   /* File system object */
    )
{
    UINT i;

    for (i = 0; i < _FS_SHARE && Files[i].fs; i++)
    {
        ;
    }
    return (i == _FS_SHARE) ? 0 : 1;
}


static
UINT inc_lock(  /* Increment file open counter and returns its index (0:int error) */
    DIR* dj,    /* Directory object pointing the file to register or increment */
    int acc     /* Desired access mode (0:Read, !0:Write) */
    )
{
    UINT i;


    for (i = 0; i < _FS_SHARE; i++)     /* Find the file */
    {
        if (Files[i].fs == dj->fs &&
            Files[i].clu == dj->sclust &&
            Files[i].idx == dj->index)
        {
            break;
        }
    }

    if (i == _FS_SHARE)                 /* Not opened. Register it as new. */
    {
        for (i = 0; i < _FS_SHARE && Files[i].fs; i++)
        {
            ;
        }
        if (i == _FS_SHARE)
        {
            return 0;                   /* No space to register (int err) */
        }
        Files[i].fs = dj->fs;
        Files[i].clu = dj->sclust;
        Files[i].idx = dj->index;
        Files[i].ctr = 0;
    }

    if (acc && Files[i].ctr)
    {
        return 0;                       /* Access violation (int err) */

    }
    Files[i].ctr = acc ? 0x100 : Files[i].ctr + 1;  /* Set semaphore value */

    return i + 1;
}


static
FRESULT dec_lock(   /* Decrement file open counter */
    UINT i          /* Semaphore index */
    )
{
    WORD n;
    FRESULT res;


    if (--i < _FS_SHARE)
    {
        n = Files[i].ctr;
        if (n == 0x100)
        {
            n = 0;
        }
        if (n)
        {
            n--;
        }
        Files[i].ctr = n;
        if (!n)
        {
            Files[i].fs = 0;
        }
        res = FR_OK;
    }
    else
    {
        res = FR_INT_ERR;
    }
    return res;
}


static
void clear_lock(    /* Clear lock entries of the volume */
    FATFS *fs
    )
{
    UINT i;

    for (i = 0; i < _FS_SHARE; i++)
    {
        if (Files[i].fs == fs)
        {
            Files[i].fs = 0;
        }
    }
}
#endif



/*-----------------------------------------------------------------------*/
/* Change window offset                                                  */
/*-----------------------------------------------------------------------*/

static
FRESULT move_window(
    FATFS *fs,      /* File system object */
    DWORD sector    /* Sector number to make appearance in the fs->win[] */
    )               /* Move to zero only writes back dirty window */
{
    DWORD wsect;


    wsect = fs->winsect;
    if (wsect != sector)    /* Changed current window */
    {
#if !_FS_READONLY
        if (fs->wflag)      /* Write back dirty window if needed */
        {
            if (disk_write(fs->drv, fs->win, wsect, 1) != RES_OK)
            {
                return FR_DISK_ERR;
            }
            fs->wflag = 0;
            if (wsect < (fs->fatbase + fs->fsize))      /* In FAT area */
            {
                BYTE nf;
                for (nf = fs->n_fats; nf > 1; nf--)     /* Reflect the change to all FAT copies */
                {
                    wsect += fs->fsize;
                    disk_write(fs->drv, fs->win, wsect, 1);
                }
            }
        }
#endif
        if (sector)
        {
            if (disk_read(fs->drv, fs->win, sector, 1) != RES_OK)
            {
                return FR_DISK_ERR;
            }
            fs->winsect = sector;
        }
    }

    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Clean-up cached data                                                  */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT sync(   /* FR_OK: successful, FR_DISK_ERR: failed */
    FATFS *fs   /* File system object */
    )
{
    FRESULT res;


    res = move_window(fs, 0);
    if (res == FR_OK)
    {
        /* Update FSInfo sector if needed */
        if (fs->fs_type == FS_FAT32 && fs->fsi_flag)
        {
            fs->winsect = 0;
            mem_set(fs->win, 0, 512);
            ST_WORD(fs->win + BS_55AA, 0xAA55);
            ST_DWORD(fs->win + FSI_LeadSig, 0x41615252);
            ST_DWORD(fs->win + FSI_StrucSig, 0x61417272);
            ST_DWORD(fs->win + FSI_Free_Count, fs->free_clust);
            ST_DWORD(fs->win + FSI_Nxt_Free, fs->last_clust);
            disk_write(fs->drv, fs->win, fs->fsi_sector, 1);
            fs->fsi_flag = 0;
        }
        /* Make sure that no pending write process in the physical drive */
        if (disk_ioctl(fs->drv, CTRL_SYNC, (void*)0) != RES_OK)
        {
            res = FR_DISK_ERR;
        }
    }

    return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* Get sector# from cluster#                                             */
/*-----------------------------------------------------------------------*/


DWORD clust2sect(   /* !=0: Sector number, 0: Failed - invalid cluster# */
    FATFS *fs,      /* File system object */
    DWORD clst      /* Cluster# to be converted */
    )
{
    clst -= 2;
    if (clst >= (fs->n_fatent - 2))
    {
        return 0;                                   /* Invalid cluster# */
    }
    return clst * fs->csize + fs->database;
}




/*-----------------------------------------------------------------------*/
/* FAT access - Read value of a FAT entry                                */
/*-----------------------------------------------------------------------*/


DWORD get_fat(  /* 0xFFFFFFFF:Disk error, 1:Internal error, Else:Cluster status */
    FATFS *fs,  /* File system object */
    DWORD clst  /* Cluster# to get the link information */
    )
{
    UINT wc, bc;
    BYTE *p;


    if (clst < 2 || clst >= fs->n_fatent)   /* Chack range */
    {
        return 1;
    }

    switch (fs->fs_type)
    {
    case FS_FAT12:
        bc = (UINT)clst; bc += bc / 2;
        if (move_window(fs, fs->fatbase + (bc / SS(fs))))
        {
            break;
        }
        wc = fs->win[bc % SS(fs)]; bc++;
        if (move_window(fs, fs->fatbase + (bc / SS(fs))))
        {
            break;
        }
        wc |= fs->win[bc % SS(fs)] << 8;
        return (clst & 1) ? (wc >> 4) : (wc & 0xFFF);

    case FS_FAT16:
        if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 2))))
        {
            break;
        }
        p = &fs->win[clst * 2 % SS(fs)];
        return LD_WORD(p);

    case FS_FAT32:
        if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))))
        {
            break;
        }
        p = &fs->win[clst * 4 % SS(fs)];
        return LD_DWORD(p) & 0x0FFFFFFF;
    }

    return 0xFFFFFFFF;  /* An error occurred at the disk I/O layer */
}




/*-----------------------------------------------------------------------*/
/* FAT access - Change value of a FAT entry                              */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY

FRESULT put_fat(
    FATFS *fs,  /* File system object */
    DWORD clst, /* Cluster# to be changed in range of 2 to fs->n_fatent - 1 */
    DWORD val   /* New value to mark the cluster */
    )
{
    UINT bc;
    BYTE *p;
    FRESULT res;


    if (clst < 2 || clst >= fs->n_fatent)   /* Check range */
    {
        res = FR_INT_ERR;

    }
    else
    {
        switch (fs->fs_type)
        {
        case FS_FAT12:
            bc = clst; bc += bc / 2;
            res = move_window(fs, fs->fatbase + (bc / SS(fs)));
            if (res != FR_OK)
            {
                break;
            }
            p = &fs->win[bc % SS(fs)];
            *p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;
            bc++;
            fs->wflag = 1;
            res = move_window(fs, fs->fatbase + (bc / SS(fs)));
            if (res != FR_OK)
            {
                break;
            }
            p = &fs->win[bc % SS(fs)];
            *p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));
            break;

        case FS_FAT16:
            res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
            if (res != FR_OK)
            {
                break;
            }
            p = &fs->win[clst * 2 % SS(fs)];
            ST_WORD(p, (WORD)val);
            break;

        case FS_FAT32:
            res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
            if (res != FR_OK)
            {
                break;
            }
            p = &fs->win[clst * 4 % SS(fs)];
            val |= LD_DWORD(p) & 0xF0000000;
            ST_DWORD(p, val);
            break;

        default:
            res = FR_INT_ERR;
        }
        fs->wflag = 1;
    }

    return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* FAT handling - Remove a cluster chain                                 */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT remove_chain(
    FATFS *fs,          /* File system object */
    DWORD clst          /* Cluster# to remove a chain from */
    )
{
    FRESULT res;
    DWORD nxt;

#if _USE_ERASE
    DWORD scl = clst, ecl = clst, resion[2];
#endif

    if (clst < 2 || clst >= fs->n_fatent)   /* Check range */
    {
        res = FR_INT_ERR;

    }
    else
    {
        res = FR_OK;
        while (clst < fs->n_fatent)             /* Not a last link? */
        {
            nxt = get_fat(fs, clst);            /* Get cluster status */
            if (nxt == 0)
            {
                break;                          /* Empty cluster? */
            }
            if (nxt == 1)
            {
                res = FR_INT_ERR; break;
            }                                           /* Internal error? */
            if (nxt == 0xFFFFFFFF)
            {
                res = FR_DISK_ERR; break;
            }                                                       /* Disk error? */
            res = put_fat(fs, clst, 0);         /* Mark the cluster "empty" */
            if (res != FR_OK)
            {
                break;
            }
            if (fs->free_clust != 0xFFFFFFFF)   /* Update FSInfo */
            {
                fs->free_clust++;
                fs->fsi_flag = 1;
            }
#if _USE_ERASE
            if (ecl + 1 == nxt)     /* Next cluster is contiguous */
            {
                ecl = nxt;
            }
            else                    /* End of contiguous clusters */
            {
                resion[0] = clust2sect(fs, scl);                    /* Start sector */
                resion[1] = clust2sect(fs, ecl) + fs->csize - 1;    /* End sector */
                disk_ioctl(fs->drv, CTRL_ERASE_SECTOR, resion);     /* Erase the block */
                scl = ecl = nxt;
            }
#endif
            clst = nxt; /* Next cluster */
        }
    }

    return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* FAT handling - Stretch or Create a cluster chain                      */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
DWORD create_chain(     /* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
    FATFS *fs,          /* File system object */
    DWORD clst          /* Cluster# to stretch. 0 means create a new chain. */
    )
{
    DWORD cs, ncl, scl;
    FRESULT res;


    if (clst == 0)          /* Create a new chain */
    {
        scl = fs->last_clust;           /* Get suggested start point */
        if (!scl || scl >= fs->n_fatent)
        {
            scl = 1;
        }
    }
    else                    /* Stretch the current chain */
    {
        cs = get_fat(fs, clst);         /* Check the cluster status */
        if (cs < 2)
        {
            return 1;                   /* It is an invalid cluster */
        }
        if (cs < fs->n_fatent)
        {
            return cs;                      /* It is already followed by next cluster */
        }
        scl = clst;
    }

    ncl = scl;              /* Start cluster */
    for (;; )
    {
        ncl++;                          /* Next cluster */
        if (ncl >= fs->n_fatent)        /* Wrap around */
        {
            ncl = 2;
            if (ncl > scl)
            {
                return 0;               /* No free cluster */
            }
        }
        cs = get_fat(fs, ncl);          /* Get the cluster status */
        if (cs == 0)
        {
            break;                      /* Found a free cluster */
        }
        if (cs == 0xFFFFFFFF || cs == 1) /* An error occurred */
        {
            return cs;
        }
        if (ncl == scl)
        {
            return 0;                   /* No free cluster */
        }
    }

    res = put_fat(fs, ncl, 0x0FFFFFFF); /* Mark the new cluster "last link" */
    if (res == FR_OK && clst != 0)
    {
        res = put_fat(fs, clst, ncl);   /* Link it to the previous one if needed */
    }
    if (res == FR_OK)
    {
        fs->last_clust = ncl;           /* Update FSINFO */
        if (fs->free_clust != 0xFFFFFFFF)
        {
            fs->free_clust--;
            fs->fsi_flag = 1;
        }
    }
    else
    {
        ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;
    }

    return ncl;     /* Return new cluster number or error code */
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Directory handling - Set directory index                              */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_sdi(
    DIR *dj,        /* Pointer to directory object */
    WORD idx        /* Directory index number */
    )
{
    DWORD clst;
    WORD ic;


    dj->index = idx;
    clst = dj->sclust;
    if (clst == 1 || clst >= dj->fs->n_fatent)  /* Check start cluster range */
    {
        return FR_INT_ERR;
    }
    if (!clst && dj->fs->fs_type == FS_FAT32)   /* Replace cluster# 0 with root cluster# if in FAT32 */
    {
        clst = dj->fs->dirbase;
    }

    if (clst == 0)      /* Static table (root-dir in FAT12/16) */
    {
        dj->clust = clst;
        if (idx >= dj->fs->n_rootdir)       /* Index is out of range */
        {
            return FR_INT_ERR;
        }
        dj->sect = dj->fs->dirbase + idx / (SS(dj->fs) / 32);   /* Sector# */
    }
    else                /* Dynamic table (sub-dirs or root-dir in FAT32) */
    {
        ic = SS(dj->fs) / 32 * dj->fs->csize;   /* Entries per cluster */
        while (idx >= ic)   /* Follow cluster chain */
        {
            clst = get_fat(dj->fs, clst);               /* Get next cluster */
            if (clst == 0xFFFFFFFF)
            {
                return FR_DISK_ERR;                     /* Disk error */
            }
            if (clst < 2 || clst >= dj->fs->n_fatent)   /* Reached to end of table or int error */
            {
                return FR_INT_ERR;
            }
            idx -= ic;
        }
        dj->clust = clst;
        dj->sect = clust2sect(dj->fs, clst) + idx / (SS(dj->fs) / 32);  /* Sector# */
    }

    dj->dir = dj->fs->win + (idx % (SS(dj->fs) / 32)) * 32; /* Ptr to the entry in the sector */

    return FR_OK;   /* Seek succeeded */
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Move directory index next                        */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_next(   /* FR_OK:Succeeded, FR_NO_FILE:End of table, FR_DENIED:EOT and could not stretch */
    DIR *dj,        /* Pointer to directory object */
    int stretch     /* 0: Do not stretch table, 1: Stretch table if needed */
    )
{
    DWORD clst;
    WORD i;


    i = dj->index + 1;
    if (!i || !dj->sect)    /* Report EOT when index has reached 65535 */
    {
        return FR_NO_FILE;
    }

    if (!(i % (SS(dj->fs) / 32)))   /* Sector changed? */
    {
        dj->sect++;                 /* Next sector */

        if (dj->clust == 0)     /* Static table */
        {
            if (i >= dj->fs->n_rootdir) /* Report EOT when end of table */
            {
                return FR_NO_FILE;
            }
        }
        else                    /* Dynamic table */
        {
            if (((i / (SS(dj->fs) / 32)) & (dj->fs->csize - 1)) == 0)   /* Cluster changed? */
            {
                clst = get_fat(dj->fs, dj->clust);              /* Get next cluster */
                if (clst <= 1)
                {
                    return FR_INT_ERR;
                }
                if (clst == 0xFFFFFFFF)
                {
                    return FR_DISK_ERR;
                }
                if (clst >= dj->fs->n_fatent)                   /* When it reached end of dynamic table */
                {
#if !_FS_READONLY
                    BYTE c;
                    if (!stretch)
                    {
                        return FR_NO_FILE;                      /* When do not stretch, report EOT */
                    }
                    clst = create_chain(dj->fs, dj->clust);     /* Stretch cluster chain */
                    if (clst == 0)
                    {
                        return FR_DENIED;                       /* No free cluster */
                    }
                    if (clst == 1)
                    {
                        return FR_INT_ERR;
                    }
                    if (clst == 0xFFFFFFFF)
                    {
                        return FR_DISK_ERR;
                    }
                    /* Clean-up stretched table */
                    if (move_window(dj->fs, 0))
                    {
                        return FR_DISK_ERR;                         /* Flush active window */
                    }
                    mem_set(dj->fs->win, 0, SS(dj->fs));            /* Clear window buffer */
                    dj->fs->winsect = clust2sect(dj->fs, clst); /* Cluster start sector */
                    for (c = 0; c < dj->fs->csize; c++)         /* Fill the new cluster with 0 */
                    {
                        dj->fs->wflag = 1;
                        if (move_window(dj->fs, 0))
                        {
                            return FR_DISK_ERR;
                        }
                        dj->fs->winsect++;
                    }
                    dj->fs->winsect -= c;                       /* Rewind window address */
#else
                    return FR_NO_FILE;          /* Report EOT */
#endif
                }
                dj->clust = clst;               /* Initialize data for new cluster */
                dj->sect = clust2sect(dj->fs, clst);
            }
        }
    }

    dj->index = i;
    dj->dir = dj->fs->win + (i % (SS(dj->fs) / 32)) * 32;

    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* LFN handling - Test/Pick/Fit an LFN segment from/to directory entry   */
/*-----------------------------------------------------------------------*/
#if _USE_LFN
static
const BYTE LfnOfs[] = { 1, 3, 5, 7, 9, 14, 16, 18, 20, 22, 24, 28, 30 };  /* Offset of LFN chars in the directory entry */


static
int cmp_lfn(            /* 1:Matched, 0:Not matched */
    WCHAR *lfnbuf,      /* Pointer to the LFN to be compared */
    BYTE *dir           /* Pointer to the directory entry containing a part of LFN */
    )
{
    UINT i, s;
    WCHAR wc, uc;


    i = ((dir[LDIR_Ord] & 0xBF) - 1) * 13;  /* Get offset in the LFN buffer */
    s = 0; wc = 1;
    do
    {
        uc = LD_WORD(dir + LfnOfs[s]);    /* Pick an LFN character from the entry */
        if (wc)     /* Last char has not been processed */
        {
            wc = ff_wtoupper(uc);       /* Convert it to upper case */
            if (i >= _MAX_LFN || wc != ff_wtoupper(lfnbuf[i++]))    /* Compare it */
            {
                return 0;               /* Not matched */
            }
        }
        else
        {
            if (uc != 0xFFFF)
            {
                return 0;               /* Check filler */
            }
        }
    }
    while (++s < 13);               /* Repeat until all chars in the entry are checked */

    if ((dir[LDIR_Ord] & 0x40) && wc && lfnbuf[i])  /* Last segment matched but different length */
    {
        return 0;
    }

    return 1;                       /* The part of LFN matched */
}



static
int pick_lfn(           /* 1:Succeeded, 0:Buffer overflow */
    WCHAR *lfnbuf,      /* Pointer to the Unicode-LFN buffer */
    BYTE *dir           /* Pointer to the directory entry */
    )
{
    UINT i, s;
    WCHAR wc, uc;


    i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;  /* Offset in the LFN buffer */

    s = 0; wc = 1;
    do
    {
        uc = LD_WORD(dir + LfnOfs[s]);        /* Pick an LFN character from the entry */
        if (wc)     /* Last char has not been processed */
        {
            if (i >= _MAX_LFN)
            {
                return 0;                   /* Buffer overflow? */
            }
            lfnbuf[i++] = wc = uc;          /* Store it */
        }
        else
        {
            if (uc != 0xFFFF)
            {
                return 0;                   /* Check filler */
            }
        }
    }
    while (++s < 13);                       /* Read all character in the entry */

    if (dir[LDIR_Ord] & 0x40)               /* Put terminator if it is the last LFN part */
    {
        if (i >= _MAX_LFN)
        {
            return 0;                       /* Buffer overflow? */
        }
        lfnbuf[i] = 0;
    }

    return 1;
}


#if !_FS_READONLY
static
void fit_lfn(
    const WCHAR *lfnbuf,    /* Pointer to the LFN buffer */
    BYTE *dir,              /* Pointer to the directory entry */
    BYTE ord,               /* LFN order (1-20) */
    BYTE sum                /* SFN sum */
    )
{
    UINT i, s;
    WCHAR wc;


    dir[LDIR_Chksum] = sum;         /* Set check sum */
    dir[LDIR_Attr] = AM_LFN;        /* Set attribute. LFN entry */
    dir[LDIR_Type] = 0;
    ST_WORD(dir + LDIR_FstClusLO, 0);

    i = (ord - 1) * 13;             /* Get offset in the LFN buffer */
    s = wc = 0;
    do
    {
        if (wc != 0xFFFF)
        {
            wc = lfnbuf[i++];               /* Get an effective char */
        }
        ST_WORD(dir + LfnOfs[s], wc); /* Put it */
        if (!wc)
        {
            wc = 0xFFFF;            /* Padding chars following last char */
        }
    }
    while (++s < 13);
    if (wc == 0xFFFF || !lfnbuf[i])
    {
        ord |= 0x40;                                /* Bottom LFN part is the start of LFN sequence */
    }
    dir[LDIR_Ord] = ord;            /* Set the LFN order */
}

#endif
#endif



/*-----------------------------------------------------------------------*/
/* Create numbered name                                                  */
/*-----------------------------------------------------------------------*/
#if _USE_LFN
void gen_numname(
    BYTE *dst,          /* Pointer to generated SFN */
    const BYTE *src,    /* Pointer to source SFN to be modified */
    const WCHAR *lfn,   /* Pointer to LFN */
    WORD seq            /* Sequence number */
    )
{
    BYTE ns[8], c;
    UINT i, j;


    mem_cpy(dst, src, 11);

    if (seq > 5)    /* On many collisions, generate a hash number instead of sequential number */
    {
        do
        {
            seq = (seq >> 1) + (seq << 15) + (WORD)*lfn++;
        }
        while (*lfn);
    }

    /* itoa */
    i = 7;
    do
    {
        c = (seq % 16) + '0';
        if (c > '9')
        {
            c += 7;
        }
        ns[i--] = c;
        seq /= 16;
    }
    while (seq);
    ns[i] = '~';

    /* Append the number */
    for (j = 0; j < i && dst[j] != ' '; j++)
    {
        if (IsDBCS1(dst[j]))
        {
            if (j == i - 1)
            {
                break;
            }
            j++;
        }
    }
    do
    {
        dst[j++] = (i < 8) ? ns[i++] : ' ';
    }
    while (j < 8);
}
#endif




/*-----------------------------------------------------------------------*/
/* Calculate sum of an SFN                                               */
/*-----------------------------------------------------------------------*/
#if _USE_LFN
static
BYTE sum_sfn(
    const BYTE *dir     /* Ptr to directory entry */
    )
{
    BYTE sum = 0;
    UINT n = 11;

    do
    {
        sum = (sum >> 1) + (sum << 7) + *dir++;
    }
    while (--n);
    return sum;
}
#endif




/*-----------------------------------------------------------------------*/
/* Directory handling - Find an object in the directory                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_find(
    DIR *dj         /* Pointer to the directory object linked to the file name */
    )
{
    FRESULT res;
    BYTE c, *dir;

#if _USE_LFN
    BYTE a, ord, sum;
#endif

    res = dir_sdi(dj, 0);           /* Rewind directory object */
    if (res != FR_OK)
    {
        return res;
    }

#if _USE_LFN
    ord = sum = 0xFF;
#endif
    do
    {
        res = move_window(dj->fs, dj->sect);
        if (res != FR_OK)
        {
            break;
        }
        dir = dj->dir;                  /* Ptr to the directory entry of current index */
        c = dir[DIR_Name];
        if (c == 0)
        {
            res = FR_NO_FILE; break;
        }                                           /* Reached to end of table */
#if _USE_LFN    /* LFN configuration */
        a = dir[DIR_Attr] & AM_MASK;
        if (c == 0xE5 || ((a & AM_VOL) && a != AM_LFN))     /* An entry without valid data */
        {
            ord = 0xFF;
        }
        else
        {
            if (a == AM_LFN)            /* An LFN entry is found */
            {
                if (dj->lfn)
                {
                    if (c & 0x40)       /* Is it start of LFN sequence? */
                    {
                        sum = dir[LDIR_Chksum];
                        c &= 0xBF; ord = c; /* LFN start order */
                        dj->lfn_idx = dj->index;
                    }
                    /* Check validity of the LFN entry and compare it with given name */
                    ord = (c == ord && sum == dir[LDIR_Chksum] && cmp_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF;
                }
            }
            else                        /* An SFN entry is found */
            {
                if (!ord && sum == sum_sfn(dir))
                {
                    break;                              /* LFN matched? */
                }
                ord = 0xFF; dj->lfn_idx = 0xFFFF;   /* Reset LFN sequence */
                if (!(dj->fn[NS] & NS_LOSS) && !mem_cmp(dir, dj->fn, 11))
                {
                    break;                                                          /* SFN matched? */
                }
            }
        }
#else       /* Non LFN configuration */
        if (!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dj->fn, 11)) /* Is it a valid entry? */
        {
            break;
        }
#endif
        res = dir_next(dj, 0);      /* Next entry */
    }
    while (res == FR_OK);

    return res;
}




/*-----------------------------------------------------------------------*/
/* Read an object from the directory                                     */
/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1
static
FRESULT dir_read(
    DIR *dj         /* Pointer to the directory object that pointing the entry to be read */
    )
{
    FRESULT res;
    BYTE c, *dir;

#if _USE_LFN
    BYTE a, ord = 0xFF, sum = 0xFF;
#endif

    res = FR_NO_FILE;
    while (dj->sect)
    {
        res = move_window(dj->fs, dj->sect);
        if (res != FR_OK)
        {
            break;
        }
        dir = dj->dir;                  /* Ptr to the directory entry of current index */
        c = dir[DIR_Name];
        if (c == 0)
        {
            res = FR_NO_FILE; break;
        }                                           /* Reached to end of table */
#if _USE_LFN    /* LFN configuration */
        a = dir[DIR_Attr] & AM_MASK;
        if (c == 0xE5 || (!_FS_RPATH && c == '.') || ((a & AM_VOL) && a != AM_LFN))     /* An entry without valid data */
        {
            ord = 0xFF;
        }
        else
        {
            if (a == AM_LFN)            /* An LFN entry is found */
            {
                if (c & 0x40)           /* Is it start of LFN sequence? */
                {
                    sum = dir[LDIR_Chksum];
                    c &= 0xBF; ord = c;
                    dj->lfn_idx = dj->index;
                }
                /* Check LFN validity and capture it */
                ord = (c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF;
            }
            else                        /* An SFN entry is found */
            {
                if (ord || sum != sum_sfn(dir)) /* Is there a valid LFN? */
                {
                    dj->lfn_idx = 0xFFFF;       /* It has no LFN. */
                }
                break;
            }
        }
#else       /* Non LFN configuration */
        if (c != 0xE5 && (_FS_RPATH || c != '.') && !(dir[DIR_Attr] & AM_VOL))  /* Is it a valid entry? */
        {
            break;
        }
#endif
        res = dir_next(dj, 0);              /* Next entry */
        if (res != FR_OK)
        {
            break;
        }
    }

    if (res != FR_OK)
    {
        dj->sect = 0;
    }

    return res;
}
#endif



/*-----------------------------------------------------------------------*/
/* Register an object to the directory                                   */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT dir_register(   /* FR_OK:Successful, FR_DENIED:No free entry or too many SFN collision, FR_DISK_ERR:Disk error */
    DIR *dj             /* Target directory with object name to be created */
    )
{
    FRESULT res;
    BYTE c, *dir;

#if _USE_LFN    /* LFN configuration */
    WORD n, ne, is;
    BYTE sn[12], *fn, sum;
    WCHAR *lfn;


    fn = dj->fn; lfn = dj->lfn;
    mem_cpy(sn, fn, 12);

    if (_FS_RPATH && (sn[NS] & NS_DOT))     /* Cannot create dot entry */
    {
        return FR_INVALID_NAME;
    }

    if (sn[NS] & NS_LOSS)           /* When LFN is out of 8.3 format, generate a numbered name */
    {
        fn[NS] = 0; dj->lfn = 0;            /* Find only SFN */
        for (n = 1; n < 100; n++)
        {
            gen_numname(fn, sn, lfn, n);    /* Generate a numbered name */
            res = dir_find(dj);             /* Check if the name collides with existing SFN */
            if (res != FR_OK)
            {
                break;
            }
        }
        if (n == 100)
        {
            return FR_DENIED;               /* Abort if too many collisions */
        }
        if (res != FR_NO_FILE)
        {
            return res;                     /* Abort if the result is other than 'not collided' */
        }
        fn[NS] = sn[NS]; dj->lfn = lfn;
    }

    if (sn[NS] & NS_LFN)            /* When LFN is to be created, reserve an SFN + LFN entries. */
    {
        for (ne = 0; lfn[ne]; ne++)
        {
            ;
        }
        ne = (ne + 25) / 13;
    }
    else                            /* Otherwise reserve only an SFN entry. */
    {
        ne = 1;
    }

    /* Reserve contiguous entries */
    res = dir_sdi(dj, 0);
    if (res != FR_OK)
    {
        return res;
    }
    n = is = 0;
    do
    {
        res = move_window(dj->fs, dj->sect);
        if (res != FR_OK)
        {
            break;
        }
        c = *dj->dir;               /* Check the entry status */
        if (c == 0xE5 || c == 0)    /* Is it a blank entry? */
        {
            if (n == 0)
            {
                is = dj->index;         /* First index of the contiguous entry */
            }
            if (++n == ne)
            {
                break;              /* A contiguous entry that required count is found */
            }
        }
        else
        {
            n = 0;                  /* Not a blank entry. Restart to search */
        }
        res = dir_next(dj, 1);      /* Next entry with table stretch */
    }
    while (res == FR_OK);

    if (res == FR_OK && ne > 1)     /* Initialize LFN entry if needed */
    {
        res = dir_sdi(dj, is);
        if (res == FR_OK)
        {
            sum = sum_sfn(dj->fn);  /* Sum of the SFN tied to the LFN */
            ne--;
            do                      /* Store LFN entries in bottom first */
            {
                res = move_window(dj->fs, dj->sect);
                if (res != FR_OK)
                {
                    break;
                }
                fit_lfn(dj->lfn, dj->dir, (BYTE)ne, sum);
                dj->fs->wflag = 1;
                res = dir_next(dj, 0);  /* Next entry */
            }
            while (res == FR_OK && --ne);
        }
    }

#else   /* Non LFN configuration */
    res = dir_sdi(dj, 0);
    if (res == FR_OK)
    {
        do      /* Find a blank entry for the SFN */
        {
            res = move_window(dj->fs, dj->sect);
            if (res != FR_OK)
            {
                break;
            }
            c = *dj->dir;
            if (c == 0xE5 || c == 0)
            {
                break;                      /* Is it a blank entry? */
            }
            res = dir_next(dj, 1);          /* Next entry with table stretch */
        }
        while (res == FR_OK);
    }
#endif

    if (res == FR_OK)       /* Initialize the SFN entry */
    {
        res = move_window(dj->fs, dj->sect);
        if (res == FR_OK)
        {
            dir = dj->dir;
            mem_set(dir, 0, 32);        /* Clean the entry */
            mem_cpy(dir, dj->fn, 11);   /* Put SFN */
#if _USE_LFN
            dir[DIR_NTres] = *(dj->fn + NS) & (NS_BODY | NS_EXT); /* Put NT flag */
#endif
            dj->fs->wflag = 1;
        }
    }

    return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Remove an object from the directory                                   */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY && !_FS_MINIMIZE
static
FRESULT dir_remove(     /* FR_OK: Successful, FR_DISK_ERR: A disk error */
    DIR *dj             /* Directory object pointing the entry to be removed */
    )
{
    FRESULT res;

#if _USE_LFN    /* LFN configuration */
    WORD i;

    i = dj->index;  /* SFN index */
    res = dir_sdi(dj, (WORD)((dj->lfn_idx == 0xFFFF) ? i : dj->lfn_idx));   /* Goto the SFN or top of the LFN entries */
    if (res == FR_OK)
    {
        do
        {
            res = move_window(dj->fs, dj->sect);
            if (res != FR_OK)
            {
                break;
            }
            *dj->dir = 0xE5;            /* Mark the entry "deleted" */
            dj->fs->wflag = 1;
            if (dj->index >= i)
            {
                break;                  /* When reached SFN, all entries of the object has been deleted. */
            }
            res = dir_next(dj, 0);      /* Next entry */
        }
        while (res == FR_OK);
        if (res == FR_NO_FILE)
        {
            res = FR_INT_ERR;
        }
    }

#else           /* Non LFN configuration */
    res = dir_sdi(dj, dj->index);
    if (res == FR_OK)
    {
        res = move_window(dj->fs, dj->sect);
        if (res == FR_OK)
        {
            *dj->dir = 0xE5;            /* Mark the entry "deleted" */
            dj->fs->wflag = 1;
        }
    }
#endif

    return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Pick a segment and create the object name in directory form           */
/*-----------------------------------------------------------------------*/

static
FRESULT create_name(
    DIR *dj,            /* Pointer to the directory object */
    const TCHAR **path  /* Pointer to pointer to the segment in the path string */
    )
{
#ifdef _EXCVT
    static const BYTE excvt[] = _EXCVT; /* Upper conversion table for extended chars */
#endif

#if _USE_LFN    /* LFN configuration */
    BYTE b, cf;
    WCHAR w, *lfn;
    UINT i, ni, si, di;
    const TCHAR *p;

    /* Create LFN in Unicode */
    si = di = 0;
    p = *path;
    lfn = dj->lfn;
    for (;; )
    {
        w = p[si++];                    /* Get a character */
        if (w < ' ' || w == '/' || w == '\\')
        {
            break;                                      /* Break on end of segment */
        }
        if (di >= _MAX_LFN)             /* Reject too long name */
        {
            return FR_INVALID_NAME;
        }
#if !_LFN_UNICODE
        w &= 0xFF;
        if (IsDBCS1(w))                 /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
        {
            b = (BYTE)p[si++];          /* Get 2nd byte */
            if (!IsDBCS2(b))
            {
                return FR_INVALID_NAME; /* Reject invalid sequence */
            }
            w = (w << 8) + b;           /* Create a DBC */
        }
        w = ff_convert(w, 1);           /* Convert ANSI/OEM to Unicode */
        if (!w)
        {
            return FR_INVALID_NAME;     /* Reject invalid code */
        }
#endif
        if (w < 0x80 && chk_chr("\"*:<>\?|\x7F", w)) /* Reject illegal chars for LFN */
        {
            return FR_INVALID_NAME;
        }
        lfn[di++] = w;                  /* Store the Unicode char */
    }
    *path = &p[si];                     /* Return pointer to the next segment */
    cf = (w < ' ') ? NS_LAST : 0;       /* Set last segment flag if end of path */
#if _FS_RPATH
    if ((di == 1 && lfn[di - 1] == '.') || /* Is this a dot entry? */
        (di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.'))
    {
        lfn[di] = 0;
        for (i = 0; i < 11; i++)
        {
            dj->fn[i] = (i < di) ? '.' : ' ';
        }
        dj->fn[i] = cf | NS_DOT;        /* This is a dot entry */
        return FR_OK;
    }
#endif
    while (di)                          /* Strip trailing spaces and dots */
    {
        w = lfn[di - 1];
        if (w != ' ' && w != '.')
        {
            break;
        }
        di--;
    }
    if (!di)
    {
        return FR_INVALID_NAME;         /* Reject nul string */

    }
    lfn[di] = 0;                        /* LFN is created */

    /* Create SFN in directory form */
    mem_set(dj->fn, ' ', 11);
    for (si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++)
    {
        ;                                                   /* Strip leading spaces and dots */
    }
    if (si)
    {
        cf |= NS_LOSS | NS_LFN;
    }
    while (di && lfn[di - 1] != '.')
    {
        di--;                               /* Find extension (di<=si: no extension) */

    }
    b = i = 0; ni = 8;
    for (;; )
    {
        w = lfn[si++];                  /* Get an LFN char */
        if (!w)
        {
            break;                      /* Break on end of the LFN */
        }
        if (w == ' ' || (w == '.' && si != di))     /* Remove spaces and dots */
        {
            cf |= NS_LOSS | NS_LFN; continue;
        }

        if (i >= ni || si == di)        /* Extension or end of SFN */
        {
            if (ni == 11)               /* Long extension */
            {
                cf |= NS_LOSS | NS_LFN; break;
            }
            if (si != di)
            {
                cf |= NS_LOSS | NS_LFN;             /* Out of 8.3 format */
            }
            if (si > di)
            {
                break;                  /* No extension */
            }
            si = di; i = 8; ni = 11;    /* Enter extension section */
            b <<= 2; continue;
        }

        if (w >= 0x80)                  /* Non ASCII char */
        {
#ifdef _EXCVT
            w = ff_convert(w, 0);       /* Unicode -> OEM code */
            if (w)
            {
                w = excvt[w - 0x80];    /* Convert extended char to upper (SBCS) */
            }
#else
            w = ff_convert(ff_wtoupper(w), 0);  /* Upper converted Unicode -> OEM code */
#endif
            cf |= NS_LFN;               /* Force create LFN entry */
        }

        if (_DF1S && w >= 0x100)        /* Double byte char (always false on SBCS cfg) */
        {
            if (i >= ni - 1)
            {
                cf |= NS_LOSS | NS_LFN; i = ni; continue;
            }
            dj->fn[i++] = (BYTE)(w >> 8);
        }
        else                            /* Single byte char */
        {
            if (!w || chk_chr("+,;=[]", w))     /* Replace illegal chars for SFN */
            {
                w = '_'; cf |= NS_LOSS | NS_LFN; /* Lossy conversion */
            }
            else
            {
                if (IsUpper(w))         /* ASCII large capital */
                {
                    b |= 2;
                }
                else
                {
                    if (IsLower(w))     /* ASCII small capital */
                    {
                        b |= 1; w -= 0x20;
                    }
                }
            }
        }
        dj->fn[i++] = (BYTE)w;
    }

    if (dj->fn[0] == 0xE5)
    {
        dj->fn[0] = 0x05;                       /* If the first char collides with deleted mark, replace it with 0x05 */

    }
    if (ni == 8)
    {
        b <<= 2;
    }
    if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03)   /* Create LFN entry when there are composite capitals */
    {
        cf |= NS_LFN;
    }
    if (!(cf & NS_LFN))                         /* When LFN is in 8.3 format without extended char, NT flags are created */
    {
        if ((b & 0x03) == 0x01)
        {
            cf |= NS_EXT;                       /* NT flag (Extension has only small capital) */
        }
        if ((b & 0x0C) == 0x04)
        {
            cf |= NS_BODY;                      /* NT flag (Filename has only small capital) */
        }
    }

    dj->fn[NS] = cf;    /* SFN is created */

    return FR_OK;


#else   /* Non-LFN configuration */
    BYTE b, c, d, *sfn;
    UINT ni, si, i;
    const char *p;

    /* Create file name in directory form */
    sfn = dj->fn;
    mem_set(sfn, ' ', 11);
    si = i = b = 0; ni = 8;
    p = *path;
#if _FS_RPATH
    if (p[si] == '.')   /* Is this a dot entry? */
    {
        for (;; )
        {
            c = (BYTE)p[si++];
            if (c != '.' || si >= 3)
            {
                break;
            }
            sfn[i++] = c;
        }
        if (c != '/' && c != '\\' && c > ' ')
        {
            return FR_INVALID_NAME;
        }
        *path = &p[si];                                 /* Return pointer to the next segment */
        sfn[NS] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;   /* Set last segment flag if end of path */
        return FR_OK;
    }
#endif
    for (;; )
    {
        c = (BYTE)p[si++];
        if (c <= ' ' || c == '/' || c == '\\')
        {
            break;                                      /* Break on end of segment */
        }
        if (c == '.' || i >= ni)
        {
            if (ni != 8 || c != '.')
            {
                return FR_INVALID_NAME;
            }
            i = 8; ni = 11;
            b <<= 2; continue;
        }
        if (c >= 0x80)                  /* Extended char? */
        {
            b |= 3;                     /* Eliminate NT flag */
#ifdef _EXCVT
            c = excvt[c - 0x80];          /* Upper conversion (SBCS) */
#else
#if !_DF1S  /* ASCII only cfg */
            return FR_INVALID_NAME;
#endif
#endif
        }
        if (IsDBCS1(c))                 /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
        {
            d = (BYTE)p[si++];          /* Get 2nd byte */
            if (!IsDBCS2(d) || i >= ni - 1) /* Reject invalid DBC */
            {
                return FR_INVALID_NAME;
            }
            sfn[i++] = c;
            sfn[i++] = d;
        }
        else                            /* Single byte code */
        {
            if (chk_chr("\"*+,:;<=>\?[]|\x7F", c))  /* Reject illegal chrs for SFN */
            {
                return FR_INVALID_NAME;
            }
            if (IsUpper(c))             /* ASCII large capital? */
            {
                b |= 2;
            }
            else
            {
                if (IsLower(c))         /* ASCII small capital? */
                {
                    b |= 1; c -= 0x20;
                }
            }
            sfn[i++] = c;
        }
    }
    *path = &p[si];                     /* Return pointer to the next segment */
    c = (c <= ' ') ? NS_LAST : 0;       /* Set last segment flag if end of path */

    if (!i)
    {
        return FR_INVALID_NAME;         /* Reject nul string */
    }
    if (sfn[0] == 0xE5)
    {
        sfn[0] = 0x05;                  /* When first char collides with 0xE5, replace it with 0x05 */

    }
    if (ni == 8)
    {
        b <<= 2;
    }
    if ((b & 0x03) == 0x01)
    {
        c |= NS_EXT;                        /* NT flag (Name extension has only small capital) */
    }
    if ((b & 0x0C) == 0x04)
    {
        c |= NS_BODY;                       /* NT flag (Name body has only small capital) */

    }
    sfn[NS] = c;        /* Store NT flag, File name is created */

    return FR_OK;
#endif
}




/*-----------------------------------------------------------------------*/
/* Get file information from directory entry                             */
/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1
static
void get_fileinfo(      /* No return code */
    DIR *dj,            /* Pointer to the directory object */
    FILINFO *fno        /* Pointer to the file information to be filled */
    )
{
    UINT i;
    BYTE nt, *dir;
    TCHAR *p, c;


    p = fno->fname;
    if (dj->sect)
    {
        dir = dj->dir;
        nt = dir[DIR_NTres];        /* NT flag */
        for (i = 0; i < 8; i++)     /* Copy name body */
        {
            c = dir[i];
            if (c == ' ')
            {
                break;
            }
            if (c == 0x05)
            {
                c = (TCHAR)0xE5;
            }
            if (_USE_LFN && (nt & NS_BODY) && IsUpper(c))
            {
                c += 0x20;
            }
#if _LFN_UNICODE
            if (IsDBCS1(c) && i < 7 && IsDBCS2(dir[i + 1]))
            {
                c = (c << 8) | dir[++i];
            }
            c = ff_convert(c, 1);
            if (!c)
            {
                c = '?';
            }
#endif
            *p++ = c;
        }
        if (dir[8] != ' ')          /* Copy name extension */
        {
            *p++ = '.';
            for (i = 8; i < 11; i++)
            {
                c = dir[i];
                if (c == ' ')
                {
                    break;
                }
                if (_USE_LFN && (nt & NS_EXT) && IsUpper(c))
                {
                    c += 0x20;
                }
#if _LFN_UNICODE
                if (IsDBCS1(c) && i < 10 && IsDBCS2(dir[i + 1]))
                {
                    c = (c << 8) | dir[++i];
                }
                c = ff_convert(c, 1);
                if (!c)
                {
                    c = '?';
                }
#endif
                *p++ = c;
            }
        }
        fno->fattrib = dir[DIR_Attr];               /* Attribute */
        fno->fsize = LD_DWORD(dir + DIR_FileSize);    /* Size */
        fno->fdate = LD_WORD(dir + DIR_WrtDate);      /* Date */
        fno->ftime = LD_WORD(dir + DIR_WrtTime);      /* Time */
    }
    *p = 0;     /* Terminate SFN str by a \0 */

#if _USE_LFN
    if (fno->lfname && fno->lfsize)
    {
        TCHAR *tp = fno->lfname;
        WCHAR w, *lfn;

        i = 0;
        if (dj->sect && dj->lfn_idx != 0xFFFF)  /* Get LFN if available */
        {
            lfn = dj->lfn;
            while ((w = *lfn++) != 0)           /* Get an LFN char */
            {
#if !_LFN_UNICODE
                w = ff_convert(w, 0);           /* Unicode -> OEM conversion */
                if (!w)
                {
                    i = 0; break;
                }                               /* Could not convert, no LFN */
                if (_DF1S && w >= 0x100)        /* Put 1st byte if it is a DBC (always false on SBCS cfg) */
                {
                    tp[i++] = (TCHAR)(w >> 8);
                }
#endif
                if (i >= fno->lfsize - 1)
                {
                    i = 0; break;
                }                                           /* Buffer overflow, no LFN */
                tp[i++] = (TCHAR)w;
            }
        }
        tp[i] = 0;  /* Terminate the LFN str by a \0 */
    }
#endif
}
#endif /* _FS_MINIMIZE <= 1 */




/*-----------------------------------------------------------------------*/
/* Follow a file path                                                    */
/*-----------------------------------------------------------------------*/

static
FRESULT follow_path(    /* FR_OK(0): successful, !=0: error code */
    DIR *dj,            /* Directory object to return last directory and found object */
    const TCHAR *path   /* Full-path string to find a file or directory */
    )
{
    FRESULT res;
    BYTE *dir, ns;


#if _FS_RPATH
    if (*path == '/' || *path == '\\')   /* There is a heading separator */
    {
        path++; dj->sclust = 0;     /* Strip it and start from the root dir */
    }
    else                                /* No heading separator */
    {
        dj->sclust = dj->fs->cdir;  /* Start from the current dir */
    }
#else
    if (*path == '/' || *path == '\\')  /* Strip heading separator if exist */
    {
        path++;
    }
    dj->sclust = 0;                     /* Start from the root dir */
#endif

    if ((UINT)*path < ' ')              /* Nul path means the start directory itself */
    {
        res = dir_sdi(dj, 0);
        dj->dir = 0;

    }
    else                                /* Follow path */
    {
        for (;; )
        {
            res = create_name(dj, &path);   /* Get a segment */
            if (res != FR_OK)
            {
                break;
            }
            res = dir_find(dj);             /* Find it */
            ns = *(dj->fn + NS);
            if (res != FR_OK)               /* Failed to find the object */
            {
                if (res != FR_NO_FILE)
                {
                    break;                      /* Abort if any hard error occured */
                }
                /* Object not found */
                if (_FS_RPATH && (ns & NS_DOT))     /* If dot entry is not exit */
                {
                    dj->sclust = 0; dj->dir = 0;    /* It is the root dir */
                    res = FR_OK;
                    if (!(ns & NS_LAST))
                    {
                        continue;
                    }
                }
                else                                /* Could not find the object */
                {
                    if (!(ns & NS_LAST))
                    {
                        res = FR_NO_PATH;
                    }
                }
                break;
            }
            if (ns & NS_LAST)
            {
                break;                          /* Last segment match. Function completed. */
            }
            dir = dj->dir;                      /* There is next segment. Follow the sub directory */
            if (!(dir[DIR_Attr] & AM_DIR))      /* Cannot follow because it is a file */
            {
                res = FR_NO_PATH; break;
            }
            dj->sclust = LD_CLUST(dir);
        }
    }

    return res;
}




/*-----------------------------------------------------------------------*/
/* Load boot record and check if it is an FAT boot record                */
/*-----------------------------------------------------------------------*/

static
BYTE check_fs(  /* 0:The FAT BR, 1:Valid BR but not an FAT, 2:Not a BR, 3:Disk error */
    FATFS *fs,  /* File system object */
    DWORD sect  /* Sector# (lba) to check if it is an FAT boot record or not */
    )
{
    if (disk_read(fs->drv, fs->win, sect, 1) != RES_OK) /* Load boot record */
    {
        return 3;
    }
    if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55)       /* Check record signature (always placed at offset 510 even if the sector size is >512) */
    {
        return 2;
    }

    if ((LD_DWORD(&fs->win[BS_FilSysType]) & 0xFFFFFF) == 0x544146) /* Check "FAT" string */
    {
        return 0;
    }
    if ((LD_DWORD(&fs->win[BS_FilSysType32]) & 0xFFFFFF) == 0x544146)
    {
        return 0;
    }

    return 1;
}




/*-----------------------------------------------------------------------*/
/* Check if the file system object is valid or not                       */
/*-----------------------------------------------------------------------*/

static
FRESULT chk_mounted(    /* FR_OK(0): successful, !=0: any error occurred */
    const TCHAR **path, /* Pointer to pointer to the path name (drive number) */
    FATFS **rfs,        /* Pointer to pointer to the found file system object */
    BYTE chk_wp         /* !=0: Check media write protection for write access */
    )
{
    BYTE fmt, b, *tbl;
    UINT vol;
    DSTATUS stat;
    DWORD bsect, fasize, tsect, sysect, nclst, szbfat;
    WORD nrsv;
    const TCHAR *p = *path;
    FATFS *fs;

    /* Get logical drive number from the path name */
    vol = p[0] - '0';                   /* Is there a drive number? */
    if (vol <= 9 && p[1] == ':')        /* Found a drive number, get and strip it */
    {
        p += 2; *path = p;              /* Return pointer to the path name */
    }
    else                                /* No drive number is given */
    {
#if _FS_RPATH
        vol = CurrVol;                  /* Use current drive */
#else
        vol = 0;                        /* Use drive 0 */
#endif
    }

    /* Check if the logical drive is valid or not */
    if (vol >= _VOLUMES)                /* Is the drive number valid? */
    {
        return FR_INVALID_DRIVE;
    }
    *rfs = fs = FatFs[vol];             /* Return pointer to the corresponding file system object */
    if (!fs)
    {
        return FR_NOT_ENABLED;          /* Is the file system object available? */

    }
    ENTER_FF(fs);                       /* Lock file system */

    if (fs->fs_type)                    /* If the logical drive has been mounted */
    {
        stat = disk_status(fs->drv);
        if (!(stat & STA_NOINIT))       /* and the physical drive is kept initialized (has not been changed), */
        {
#if !_FS_READONLY
            if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */
            {
                return FR_WRITE_PROTECTED;
            }
#endif
            return FR_OK;               /* The file system object is valid */
        }
    }

    /* The logical drive must be mounted. */
    /* Following code attempts to mount a volume. (analyze BPB and initialize the fs object) */

    fs->fs_type = 0;                    /* Clear the file system object */
    fs->drv = (BYTE)LD2PD(vol);         /* Bind the logical drive and a physical drive */
    stat = disk_initialize(fs->drv);    /* Initialize low level disk I/O layer */
    if (stat & STA_NOINIT)              /* Check if the initialization succeeded */
    {
        return FR_NOT_READY;            /* Failed to initialize due to no media or hard error */
    }
#if _MAX_SS != 512                      /* Get disk sector size (variable sector size cfg only) */
    if (disk_ioctl(fs->drv, GET_SECTOR_SIZE, &fs->ssize) != RES_OK)
    {
        return FR_DISK_ERR;
    }
#endif
#if !_FS_READONLY
    if (chk_wp && (stat & STA_PROTECT)) /* Check disk write protection if needed */
    {
        return FR_WRITE_PROTECTED;
    }
#endif
    /* Search FAT partition on the drive. Supports only generic partitionings, FDISK and SFD. */
    fmt = check_fs(fs, bsect = 0);      /* Check sector 0 if it is a VBR */
    if (fmt == 1)                       /* Not an FAT-VBR, the disk may be partitioned */
    {   /* Check the partition listed in top of the partition table */
        tbl = &fs->win[MBR_Table + LD2PT(vol) * 16];    /* Partition table */
        if (tbl[4])                                     /* Is the partition existing? */
        {
            bsect = LD_DWORD(&tbl[8]);                  /* Partition offset in LBA */
            fmt = check_fs(fs, bsect);                  /* Check the partition */
        }
    }
    if (fmt == 3)
    {
        return FR_DISK_ERR;
    }
    if (fmt)
    {
        return FR_NO_FILESYSTEM;                        /* No FAT volume is found */

    }
    /* Following code initializes the file system object */

    if (LD_WORD(fs->win + BPB_BytsPerSec) != SS(fs))      /* (BPB_BytsPerSec must be equal to the physical sector size) */
    {
        return FR_NO_FILESYSTEM;
    }

    fasize = LD_WORD(fs->win + BPB_FATSz16);              /* Number of sectors per FAT */
    if (!fasize)
    {
        fasize = LD_DWORD(fs->win + BPB_FATSz32);
    }
    fs->fsize = fasize;

    fs->n_fats = b = fs->win[BPB_NumFATs];              /* Number of FAT copies */
    if (b != 1 && b != 2)
    {
        return FR_NO_FILESYSTEM;                        /* (Must be 1 or 2) */
    }
    fasize *= b;                                        /* Number of sectors for FAT area */

    fs->csize = b = fs->win[BPB_SecPerClus];            /* Number of sectors per cluster */
    if (!b || (b & (b - 1)))
    {
        return FR_NO_FILESYSTEM;                        /* (Must be power of 2) */

    }
    fs->n_rootdir = LD_WORD(fs->win + BPB_RootEntCnt);    /* Number of root directory entries */
    if (fs->n_rootdir % (SS(fs) / 32))
    {
        return FR_NO_FILESYSTEM;                                /* (BPB_RootEntCnt must be sector aligned) */

    }
    tsect = LD_WORD(fs->win + BPB_TotSec16);              /* Number of sectors on the volume */
    if (!tsect)
    {
        tsect = LD_DWORD(fs->win + BPB_TotSec32);
    }

    nrsv = LD_WORD(fs->win + BPB_RsvdSecCnt);             /* Number of reserved sectors */
    if (!nrsv)
    {
        return FR_NO_FILESYSTEM;                        /* (BPB_RsvdSecCnt must not be 0) */

    }
    /* Determine the FAT sub type */
    sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / 32); /* RSV+FAT+DIR */
    if (tsect < sysect)
    {
        return FR_NO_FILESYSTEM;                        /* (Invalid volume size) */
    }
    nclst = (tsect - sysect) / fs->csize;               /* Number of clusters */
    if (!nclst)
    {
        return FR_NO_FILESYSTEM;                        /* (Invalid volume size) */
    }
    fmt = FS_FAT12;
    if (nclst >= MIN_FAT16)
    {
        fmt = FS_FAT16;
    }
    if (nclst >= MIN_FAT32)
    {
        fmt = FS_FAT32;
    }

    /* Boundaries and Limits */
    fs->n_fatent = nclst + 2;                           /* Number of FAT entries */
    fs->database = bsect + sysect;                      /* Data start sector */
    fs->fatbase = bsect + nrsv;                         /* FAT start sector */
    if (fmt == FS_FAT32)
    {
        if (fs->n_rootdir)
        {
            return FR_NO_FILESYSTEM;                    /* (BPB_RootEntCnt must be 0) */
        }
        fs->dirbase = LD_DWORD(fs->win + BPB_RootClus);   /* Root directory start cluster */
        szbfat = fs->n_fatent * 4;                      /* (Required FAT size) */
    }
    else
    {
        if (!fs->n_rootdir)
        {
            return FR_NO_FILESYSTEM;                    /* (BPB_RootEntCnt must not be 0) */
        }
        fs->dirbase = fs->fatbase + fasize;             /* Root directory start sector */
        szbfat = (fmt == FS_FAT16) ?                    /* (Required FAT size) */
                 fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
    }
    if (fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs))   /* (FAT size must not be less than FAT sectors */
    {
        return FR_NO_FILESYSTEM;
    }

#if !_FS_READONLY
    /* Initialize cluster allocation information */
    fs->free_clust = 0xFFFFFFFF;
    fs->last_clust = 0;

    /* Get fsinfo if available */
    if (fmt == FS_FAT32)
    {
        fs->fsi_flag = 0;
        fs->fsi_sector = bsect + LD_WORD(fs->win + BPB_FSInfo);
        if (disk_read(fs->drv, fs->win, fs->fsi_sector, 1) == RES_OK &&
            LD_WORD(fs->win + BS_55AA) == 0xAA55 &&
            LD_DWORD(fs->win + FSI_LeadSig) == 0x41615252 &&
            LD_DWORD(fs->win + FSI_StrucSig) == 0x61417272)
        {
            fs->last_clust = LD_DWORD(fs->win + FSI_Nxt_Free);
            fs->free_clust = LD_DWORD(fs->win + FSI_Free_Count);
        }
    }
#endif
    fs->fs_type = fmt;      /* FAT sub-type */
    fs->id = ++Fsid;        /* File system mount ID */
    fs->winsect = 0;        /* Invalidate sector cache */
    fs->wflag = 0;
#if _FS_RPATH
    fs->cdir = 0;           /* Current directory (root dir) */
#endif
#if _FS_SHARE               /* Clear file lock semaphores */
    clear_lock(fs);
#endif

    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Check if the file/dir object is valid or not                          */
/*-----------------------------------------------------------------------*/

static
FRESULT validate(   /* FR_OK(0): The object is valid, !=0: Invalid */
    FATFS *fs,      /* Pointer to the file system object */
    WORD id         /* Member id of the target object to be checked */
    )
{
    if (!fs || !fs->fs_type || fs->id != id)
    {
        return FR_INVALID_OBJECT;
    }

    ENTER_FF(fs);       /* Lock file system */

    if (disk_status(fs->drv) & STA_NOINIT)
    {
        return FR_NOT_READY;
    }

    return FR_OK;
}




/*--------------------------------------------------------------------------

   Public Functions

   --------------------------------------------------------------------------*/



/*-----------------------------------------------------------------------*/
/* Mount/Unmount a Logical Drive                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_mount(
    BYTE vol,       /* Logical drive number to be mounted/unmounted */
    FATFS *fs       /* Pointer to new file system object (NULL for unmount)*/
    )
{
    FATFS *rfs;


    if (vol >= _VOLUMES)            /* Check if the drive number is valid */
    {
        return FR_INVALID_DRIVE;
    }
    rfs = FatFs[vol];               /* Get current fs object */

    if (rfs)
    {
#if _FS_SHARE
        clear_lock(rfs);
#endif
#if _FS_REENTRANT                   /* Discard sync object of the current volume */
        if (!ff_del_syncobj(rfs->sobj))
        {
            return FR_INT_ERR;
        }
#endif
        rfs->fs_type = 0;           /* Clear old fs object */
    }

    if (fs)
    {
        fs->fs_type = 0;            /* Clear new fs object */
#if _FS_REENTRANT                   /* Create sync object for the new volume */
        if (!ff_cre_syncobj(vol, &fs->sobj))
        {
            return FR_INT_ERR;
        }
#endif
    }
    FatFs[vol] = fs;                /* Register new fs object */

    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Open or Create a File                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_open(
    FIL *fp,            /* Pointer to the blank file object */
    const TCHAR *path,  /* Pointer to the file name */
    BYTE mode           /* Access mode and file open mode flags */
    )
{
    FRESULT res;
    DIR dj;
    BYTE *dir;

    DEF_NAMEBUF;


    fp->fs = 0;         /* Clear file object */

#if !_FS_READONLY
    mode &= FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW;
    res = chk_mounted(&path, &dj.fs, (BYTE)(mode & ~FA_READ));
#else
    mode &= FA_READ;
    res = chk_mounted(&path, &dj.fs, 0);
#endif
    INIT_BUF(dj);
    if (res == FR_OK)
    {
        res = follow_path(&dj, path);   /* Follow the file path */
    }
    dir = dj.dir;

#if !_FS_READONLY   /* R/W configuration */
    if (res == FR_OK)
    {
        if (!dir)   /* Current dir itself */
        {
            res = FR_INVALID_NAME;
        }
#if _FS_SHARE
        else
        {
            res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
        }
#endif
    }
    /* Create or Open a file */
    if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW))
    {
        DWORD dw, cl;

        if (res != FR_OK)                   /* No file, create new */
        {
            if (res == FR_NO_FILE)          /* There is no file to open, create a new entry */
#if _FS_SHARE
            { res = enq_lock(dj.fs) ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES; }
#else
            { res = dir_register(&dj); }
#endif
            mode |= FA_CREATE_ALWAYS;       /* File is created */
            dir = dj.dir;                   /* New entry */
        }
        else                                /* Any object is already existing */
        {
            if (mode & FA_CREATE_NEW)       /* Cannot create new */
            {
                res = FR_EXIST;
            }
            else
            {
                if (dir[DIR_Attr] & (AM_RDO | AM_DIR))  /* Cannot overwrite it (R/O or DIR) */
                {
                    res = FR_DENIED;
                }
            }
        }
        if (res == FR_OK && (mode & FA_CREATE_ALWAYS))      /* Truncate it if overwrite mode */
        {
            dw = get_fattime();                 /* Created time */
            ST_DWORD(dir + DIR_CrtTime, dw);
            dir[DIR_Attr] = 0;                  /* Reset attribute */
            ST_DWORD(dir + DIR_FileSize, 0);      /* size = 0 */
            cl = LD_CLUST(dir);                 /* Get start cluster */
            ST_CLUST(dir, 0);                   /* cluster = 0 */
            dj.fs->wflag = 1;
            if (cl)                             /* Remove the cluster chain if exist */
            {
                dw = dj.fs->winsect;
                res = remove_chain(dj.fs, cl);
                if (res == FR_OK)
                {
                    dj.fs->last_clust = cl - 1; /* Reuse the cluster hole */
                    res = move_window(dj.fs, dw);
                }
            }
        }
    }
    else    /* Open an existing file */
    {
        if (res == FR_OK)                       /* Follow succeeded */
        {
            if (dir[DIR_Attr] & AM_DIR)         /* It is a directory */
            {
                res = FR_NO_FILE;
            }
            else
            {
                if ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */
                {
                    res = FR_DENIED;
                }
            }
        }
    }
    if (res == FR_OK)
    {
        if (mode & FA_CREATE_ALWAYS)            /* Set file change flag if created or overwritten */
        {
            mode |= FA__WRITTEN;
        }
        fp->dir_sect = dj.fs->winsect;          /* Pointer to the directory entry */
        fp->dir_ptr = dir;
#if _FS_SHARE
        fp->lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
        if (!fp->lockid)
        {
            res = FR_INT_ERR;
        }
#endif
    }

#else               /* R/O configuration */
    if (res == FR_OK)                   /* Follow succeeded */
    {
        if (!dir)                       /* Current dir itself */
        {
            res = FR_INVALID_NAME;
        }
        else
        {
            if (dir[DIR_Attr] & AM_DIR) /* It is a directory */
            {
                res = FR_NO_FILE;
            }
        }
    }
#endif
    FREE_BUF();

    if (res == FR_OK)
    {
        fp->flag = mode;                    /* File access mode */
        fp->org_clust = LD_CLUST(dir);      /* File start cluster */
        fp->fsize = LD_DWORD(dir + DIR_FileSize); /* File size */
        fp->fptr = 0;                       /* File pointer */
        fp->dsect = 0;
#if _USE_FASTSEEK
        fp->cltbl = 0;                      /* No cluster link map table */
#endif
        fp->fs = dj.fs; fp->id = dj.fs->id; /* Validate file object */
    }

    LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Read File                                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_read(
    FIL *fp,        /* Pointer to the file object */
    void *buff,     /* Pointer to data buffer */
    UINT btr,       /* Number of bytes to read */
    UINT *br        /* Pointer to number of bytes read */
    )
{
    FRESULT res;
    DWORD clst, sect, remain;
    UINT rcnt, cc;
    BYTE csect, *rbuff = buff;


    *br = 0;    /* Initialize byte counter */

    res = validate(fp->fs, fp->id);                 /* Check validity of the object */
    if (res != FR_OK)
    {
        LEAVE_FF(fp->fs, res);
    }
    if (fp->flag & FA__ERROR)                       /* Check abort flag */
    {
        LEAVE_FF(fp->fs, FR_INT_ERR);
    }
    if (!(fp->flag & FA_READ))                      /* Check access mode */
    {
        LEAVE_FF(fp->fs, FR_DENIED);
    }
    remain = fp->fsize - fp->fptr;
    if (btr > remain)
    {
        btr = (UINT)remain;                         /* Truncate btr by remaining bytes */

    }
    for (; btr;                                     /* Repeat until all data transferred */
         rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt)
    {
        if ((fp->fptr % SS(fp->fs)) == 0)           /* On the sector boundary? */
        {
            csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
            if (!csect)                             /* On the cluster boundary? */
            {
                clst = (fp->fptr == 0) ?            /* On the top of the file? */
                       fp->org_clust : get_fat(fp->fs, fp->curr_clust);
                if (clst <= 1)
                {
                    ABORT(fp->fs, FR_INT_ERR);
                }
                if (clst == 0xFFFFFFFF)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
                fp->curr_clust = clst;              /* Update current cluster */
            }
            sect = clust2sect(fp->fs, fp->curr_clust);  /* Get current sector */
            if (!sect)
            {
                ABORT(fp->fs, FR_INT_ERR);
            }
            sect += csect;
            cc = btr / SS(fp->fs);                  /* When remaining bytes >= sector size, */
            if (cc)                                 /* Read maximum contiguous sectors directly */
            {
                if (csect + cc > fp->fs->csize)     /* Clip at cluster boundary */
                {
                    cc = fp->fs->csize - csect;
                }
                if (disk_read(fp->fs->drv, rbuff, sect, (BYTE)cc) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
#if !_FS_READONLY && _FS_MINIMIZE <= 2              /* Replace one of the read sectors with cached data if it contains a dirty sector */
#if _FS_TINY
                if (fp->fs->wflag && fp->fs->winsect - sect < cc)
                {
                    mem_cpy(rbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), fp->fs->win, SS(fp->fs));
                }
#else
                if ((fp->flag & FA__DIRTY) && fp->dsect - sect < cc)
                {
                    mem_cpy(rbuff + ((fp->dsect - sect) * SS(fp->fs)), fp->buf, SS(fp->fs));
                }
#endif
#endif
                rcnt = SS(fp->fs) * cc;             /* Number of bytes transferred */
                continue;
            }
#if !_FS_TINY
#if !_FS_READONLY
            if (fp->flag & FA__DIRTY)               /* Write sector I/O buffer if needed */
            {
                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
                fp->flag &= ~FA__DIRTY;
            }
#endif
            if (fp->dsect != sect)                  /* Fill sector buffer with file data */
            {
                if (disk_read(fp->fs->drv, fp->buf, sect, 1) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
            }
#endif
            fp->dsect = sect;
        }
        rcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs));    /* Get partial sector data from sector buffer */
        if (rcnt > btr)
        {
            rcnt = btr;
        }
#if _FS_TINY
        if (move_window(fp->fs, fp->dsect))         /* Move sector window */
        {
            ABORT(fp->fs, FR_DISK_ERR);
        }
        mem_cpy(rbuff, &fp->fs->win[fp->fptr % SS(fp->fs)], rcnt);  /* Pick partial sector */
#else
        mem_cpy(rbuff, &fp->buf[fp->fptr % SS(fp->fs)], rcnt);  /* Pick partial sector */
#endif
    }

    LEAVE_FF(fp->fs, FR_OK);
}




#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Write File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_write(
    FIL *fp,            /* Pointer to the file object */
    const void *buff,   /* Pointer to the data to be written */
    UINT btw,           /* Number of bytes to write */
    UINT *bw            /* Pointer to number of bytes written */
    )
{
    FRESULT res;
    DWORD clst, sect;
    UINT wcnt, cc;
    const BYTE *wbuff = buff;
    BYTE csect;


    *bw = 0;    /* Initialize byte counter */

    res = validate(fp->fs, fp->id);                 /* Check validity of the object */
    if (res != FR_OK)
    {
        LEAVE_FF(fp->fs, res);
    }
    if (fp->flag & FA__ERROR)                       /* Check abort flag */
    {
        LEAVE_FF(fp->fs, FR_INT_ERR);
    }
    if (!(fp->flag & FA_WRITE))                     /* Check access mode */
    {
        LEAVE_FF(fp->fs, FR_DENIED);
    }
    if (fp->fsize + btw < fp->fsize)
    {
        btw = 0;                                    /* File size cannot reach 4GB */

    }
    for (; btw;                                     /* Repeat until all data transferred */
         wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt)
    {
        if ((fp->fptr % SS(fp->fs)) == 0)           /* On the sector boundary? */
        {
            csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
            if (!csect)                             /* On the cluster boundary? */
            {
                if (fp->fptr == 0)                  /* On the top of the file? */
                {
                    clst = fp->org_clust;           /* Follow from the origin */
                    if (clst == 0)                  /* When there is no cluster chain, */
                    {
                        fp->org_clust = clst = create_chain(fp->fs, 0); /* Create a new cluster chain */
                    }
                }
                else                                /* Middle or end of the file */
                {
                    clst = create_chain(fp->fs, fp->curr_clust);            /* Follow or stretch cluster chain */
                }
                if (clst == 0)
                {
                    break;                          /* Could not allocate a new cluster (disk full) */
                }
                if (clst == 1)
                {
                    ABORT(fp->fs, FR_INT_ERR);
                }
                if (clst == 0xFFFFFFFF)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
                fp->curr_clust = clst;              /* Update current cluster */
            }
#if _FS_TINY
            if (fp->fs->winsect == fp->dsect && move_window(fp->fs, 0)) /* Write back data buffer prior to following direct transfer */
            {
                ABORT(fp->fs, FR_DISK_ERR);
            }
#else
            if (fp->flag & FA__DIRTY)       /* Write back data buffer prior to following direct transfer */
            {
                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
                fp->flag &= ~FA__DIRTY;
            }
#endif
            sect = clust2sect(fp->fs, fp->curr_clust);  /* Get current sector */
            if (!sect)
            {
                ABORT(fp->fs, FR_INT_ERR);
            }
            sect += csect;
            cc = btw / SS(fp->fs);                  /* When remaining bytes >= sector size, */
            if (cc)                                 /* Write maximum contiguous sectors directly */
            {
                if (csect + cc > fp->fs->csize)     /* Clip at cluster boundary */
                {
                    cc = fp->fs->csize - csect;
                }
                if (disk_write(fp->fs->drv, wbuff, sect, (BYTE)cc) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
#if _FS_TINY
                if (fp->fs->winsect - sect < cc)    /* Refill sector cache if it gets dirty by the direct write */
                {
                    mem_cpy(fp->fs->win, wbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), SS(fp->fs));
                    fp->fs->wflag = 0;
                }
#else
                if (fp->dsect - sect < cc)          /* Refill sector cache if it gets dirty by the direct write */
                {
                    mem_cpy(fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs));
                    fp->flag &= ~FA__DIRTY;
                }
#endif
                wcnt = SS(fp->fs) * cc;             /* Number of bytes transferred */
                continue;
            }
#if _FS_TINY
            if (fp->fptr >= fp->fsize)              /* Avoid silly buffer filling at growing edge */
            {
                if (move_window(fp->fs, 0))
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
                fp->fs->winsect = sect;
            }
#else
            if (fp->dsect != sect)                  /* Fill sector buffer with file data */
            {
                if (fp->fptr < fp->fsize &&
                    disk_read(fp->fs->drv, fp->buf, sect, 1) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
            }
#endif
            fp->dsect = sect;
        }
        wcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs)); /* Put partial sector into file I/O buffer */
        if (wcnt > btw)
        {
            wcnt = btw;
        }
#if _FS_TINY
        if (move_window(fp->fs, fp->dsect))         /* Move sector window */
        {
            ABORT(fp->fs, FR_DISK_ERR);
        }
        mem_cpy(&fp->fs->win[fp->fptr % SS(fp->fs)], wbuff, wcnt);  /* Fit partial sector */
        fp->fs->wflag = 1;
#else
        mem_cpy(&fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt);  /* Fit partial sector */
        fp->flag |= FA__DIRTY;
#endif
    }

    if (fp->fptr > fp->fsize)
    {
        fp->fsize = fp->fptr;                       /* Update file size if needed */
    }
    fp->flag |= FA__WRITTEN;                        /* Set file change flag */

    LEAVE_FF(fp->fs, FR_OK);
}




/*-----------------------------------------------------------------------*/
/* Synchronize the File Object                                           */
/*-----------------------------------------------------------------------*/

FRESULT f_sync(
    FIL *fp     /* Pointer to the file object */
    )
{
    FRESULT res;
    DWORD tim;
    BYTE *dir;


    res = validate(fp->fs, fp->id);     /* Check validity of the object */
    if (res == FR_OK)
    {
        if (fp->flag & FA__WRITTEN)     /* Has the file been written? */
        {
#if !_FS_TINY   /* Write-back dirty buffer */
            if (fp->flag & FA__DIRTY)
            {
                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                {
                    LEAVE_FF(fp->fs, FR_DISK_ERR);
                }
                fp->flag &= ~FA__DIRTY;
            }
#endif
            /* Update the directory entry */
            res = move_window(fp->fs, fp->dir_sect);
            if (res == FR_OK)
            {
                dir = fp->dir_ptr;
                dir[DIR_Attr] |= AM_ARC;                    /* Set archive bit */
                ST_DWORD(dir + DIR_FileSize, fp->fsize);      /* Update file size */
                ST_CLUST(dir, fp->org_clust);               /* Update start cluster */
                tim = get_fattime();                        /* Update updated time */
                ST_DWORD(dir + DIR_WrtTime, tim);
                fp->flag &= ~FA__WRITTEN;
                fp->fs->wflag = 1;
                res = sync(fp->fs);
            }
        }
    }

    LEAVE_FF(fp->fs, res);
}

#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Close File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_close(
    FIL *fp     /* Pointer to the file object to be closed */
    )
{
    FRESULT res;

#if _FS_READONLY
    FATFS *fs = fp->fs;
    res = validate(fs, fp->id);
    if (res == FR_OK)
    {
        fp->fs = 0;                 /* Discard file object */
    }
    LEAVE_FF(fs, res);

#else
    res = f_sync(fp);       /* Flush cached data */
#if _FS_SHARE
    if (res == FR_OK)       /* Decrement open counter */
    {
#if _FS_REENTRANT
        res = validate(fp->fs, fp->id);
        if (res == FR_OK)
        {
            res = dec_lock(fp->lockid);
            unlock_fs(fp->fs, FR_OK);
        }
#else
        res = dec_lock(fp->lockid);
#endif
    }
#endif
    if (res == FR_OK)
    {
        fp->fs = 0;                 /* Discard file object */
    }
    return res;
#endif
}




/*-----------------------------------------------------------------------*/
/* Current Drive/Directory Handlings                                     */
/*-----------------------------------------------------------------------*/

#if _FS_RPATH >= 1

FRESULT f_chdrive(
    BYTE drv        /* Drive number */
    )
{
    if (drv >= _VOLUMES)
    {
        return FR_INVALID_DRIVE;
    }

    CurrVol = drv;

    return FR_OK;
}



FRESULT f_chdir(
    const TCHAR *path   /* Pointer to the directory path */
    )
{
    FRESULT res;
    DIR dj;

    DEF_NAMEBUF;


    res = chk_mounted(&path, &dj.fs, 0);
    if (res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);       /* Follow the path */
        FREE_BUF();
        if (res == FR_OK)                   /* Follow completed */
        {
            if (!dj.dir)
            {
                dj.fs->cdir = dj.sclust;    /* Start directory itself */
            }
            else
            {
                if (dj.dir[DIR_Attr] & AM_DIR)  /* Reached to the directory */
                {
                    dj.fs->cdir = LD_CLUST(dj.dir);
                }
                else
                {
                    res = FR_NO_PATH;       /* Reached but a file */
                }
            }
        }
        if (res == FR_NO_FILE)
        {
            res = FR_NO_PATH;
        }
    }

    LEAVE_FF(dj.fs, res);
}


#if _FS_RPATH >= 2
FRESULT f_getcwd(
    TCHAR *path,    /* Pointer to the directory path */
    UINT sz_path    /* Size of path */
    )
{
    FRESULT res;
    DIR dj;
    UINT i, n;
    DWORD ccl;
    TCHAR *tp;
    FILINFO fno;

    DEF_NAMEBUF;


    *path = 0;
    res = chk_mounted((const TCHAR**)&path, &dj.fs, 0); /* Get current volume */
    if (res == FR_OK)
    {
        INIT_BUF(dj);
        i = sz_path;        /* Bottom of buffer (dir stack base) */
        dj.sclust = dj.fs->cdir;            /* Start to follow upper dir from current dir */
        while ((ccl = dj.sclust) != 0)      /* Repeat while current dir is a sub-dir */
        {
            res = dir_sdi(&dj, 1);          /* Get parent dir */
            if (res != FR_OK)
            {
                break;
            }
            res = dir_read(&dj);
            if (res != FR_OK)
            {
                break;
            }
            dj.sclust = LD_CLUST(dj.dir);   /* Goto parent dir */
            res = dir_sdi(&dj, 0);
            if (res != FR_OK)
            {
                break;
            }
            do                              /* Find the entry links to the child dir */
            {
                res = dir_read(&dj);
                if (res != FR_OK)
                {
                    break;
                }
                if (ccl == LD_CLUST(dj.dir))
                {
                    break;                          /* Found the entry */
                }
                res = dir_next(&dj, 0);
            }
            while (res == FR_OK);
            if (res == FR_NO_FILE)
            {
                res = FR_INT_ERR;                   /* It cannot be 'not found'. */
            }
            if (res != FR_OK)
            {
                break;
            }
#if _USE_LFN
            fno.lfname = path;
            fno.lfsize = i;
#endif
            get_fileinfo(&dj, &fno);        /* Get the dir name and push it to the buffer */
            tp = fno.fname;
            if (_USE_LFN && *path)
            {
                tp = path;
            }
            for (n = 0; tp[n]; n++)
            {
                ;
            }
            if (i < n + 3)
            {
                res = FR_NOT_ENOUGH_CORE; break;
            }
            while (n)
            {
                path[--i] = tp[--n];
            }
            path[--i] = '/';
        }
        tp = path;
        if (res == FR_OK)
        {
            *tp++ = '0' + CurrVol;          /* Put drive number */
            *tp++ = ':';
            if (i == sz_path)               /* Root-dir */
            {
                *tp++ = '/';
            }
            else                            /* Sub-dir */
            {
                do      /* Add stacked path str */
                {
                    *tp++ = path[i++];
                }
                while (i < sz_path);
            }
        }
        *tp = 0;
        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _FS_RPATH >= 2 */
#endif /* _FS_RPATH >= 1 */



#if _FS_MINIMIZE <= 2
/*-----------------------------------------------------------------------*/
/* Seek File R/W Pointer                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_lseek(
    FIL *fp,        /* Pointer to the file object */
    DWORD ofs       /* File pointer from top of file */
    )
{
    FRESULT res;


    res = validate(fp->fs, fp->id);     /* Check validity of the object */
    if (res != FR_OK)
    {
        LEAVE_FF(fp->fs, res);
    }
    if (fp->flag & FA__ERROR)           /* Check abort flag */
    {
        LEAVE_FF(fp->fs, FR_INT_ERR);
    }

#if _USE_FASTSEEK
    if (fp->cltbl)      /* Fast seek */
    {
        DWORD cl, pcl, ncl, tcl, dsc, tlen, *tbl = fp->cltbl;
        BYTE csc;

        tlen = *tbl++;
        if (ofs == CREATE_LINKMAP)      /* Create link map table */
        {
            cl = fp->org_clust;
            if (cl)
            {
                do
                {
                    if (tlen < 4)   /* Not enough table items */
                    {
                        res = FR_NOT_ENOUGH_CORE; break;
                    }
                    tcl = cl; ncl = 0;
                    do          /* Get a fragment and store the top and length */
                    {
                        pcl = cl; ncl++;
                        cl = get_fat(fp->fs, cl);
                        if (cl <= 1)
                        {
                            ABORT(fp->fs, FR_INT_ERR);
                        }
                        if (cl == 0xFFFFFFFF)
                        {
                            ABORT(fp->fs, FR_DISK_ERR);
                        }
                    }
                    while (cl == pcl + 1);
                    *tbl++ = ncl; *tbl++ = tcl;
                    tlen -= 2;
                }
                while (cl < fp->fs->n_fatent);
            }
            *tbl = 0;   /* Terminate table */

        }
        else                            /* Fast seek */
        {
            if (ofs > fp->fsize)        /* Clip offset at the file size */
            {
                ofs = fp->fsize;
            }
            fp->fptr = ofs;             /* Set file pointer */
            if (ofs)
            {
                dsc = (ofs - 1) / SS(fp->fs);
                cl = dsc / fp->fs->csize;
                for (;; )
                {
                    ncl = *tbl++;
                    if (!ncl)
                    {
                        ABORT(fp->fs, FR_INT_ERR);
                    }
                    if (cl < ncl)
                    {
                        break;
                    }
                    cl -= ncl; tbl++;
                }
                fp->curr_clust = cl + *tbl;
                csc = (BYTE)(dsc & (fp->fs->csize - 1));
                dsc = clust2sect(fp->fs, fp->curr_clust);
                if (!dsc)
                {
                    ABORT(fp->fs, FR_INT_ERR);
                }
                dsc += csc;
                if (fp->fptr % SS(fp->fs) && dsc != fp->dsect)
                {
#if !_FS_TINY
#if !_FS_READONLY
                    if (fp->flag & FA__DIRTY)       /* Flush dirty buffer if needed */
                    {
                        if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                        {
                            ABORT(fp->fs, FR_DISK_ERR);
                        }
                        fp->flag &= ~FA__DIRTY;
                    }
#endif
                    if (disk_read(fp->fs->drv, fp->buf, dsc, 1) != RES_OK)
                    {
                        ABORT(fp->fs, FR_DISK_ERR);
                    }
#endif
                    fp->dsect = dsc;
                }
            }
        }
    }
    else
#endif

    /* Normal Seek */
    {
        DWORD clst, bcs, nsect, ifptr;

        if (ofs > fp->fsize                 /* In read-only mode, clip offset with the file size */
#if !_FS_READONLY
            && !(fp->flag & FA_WRITE)
#endif
            )
        {
            ofs = fp->fsize;
        }

        ifptr = fp->fptr;
        fp->fptr = nsect = 0;
        if (ofs)
        {
            bcs = (DWORD)fp->fs->csize * SS(fp->fs);    /* Cluster size (byte) */
            if (ifptr > 0 &&
                (ofs - 1) / bcs >= (ifptr - 1) / bcs)   /* When seek to same or following cluster, */
            {
                fp->fptr = (ifptr - 1) & ~(bcs - 1);    /* start from the current cluster */
                ofs -= fp->fptr;
                clst = fp->curr_clust;
            }
            else                                        /* When seek to back cluster, */
            {
                clst = fp->org_clust;                   /* start from the first cluster */
#if !_FS_READONLY
                if (clst == 0)                          /* If no cluster chain, create a new chain */
                {
                    clst = create_chain(fp->fs, 0);
                    if (clst == 1)
                    {
                        ABORT(fp->fs, FR_INT_ERR);
                    }
                    if (clst == 0xFFFFFFFF)
                    {
                        ABORT(fp->fs, FR_DISK_ERR);
                    }
                    fp->org_clust = clst;
                }
#endif
                fp->curr_clust = clst;
            }
            if (clst != 0)
            {
                while (ofs > bcs)                       /* Cluster following loop */
                {
#if !_FS_READONLY
                    if (fp->flag & FA_WRITE)            /* Check if in write mode or not */
                    {
                        clst = create_chain(fp->fs, clst);  /* Force stretch if in write mode */
                        if (clst == 0)                  /* When disk gets full, clip file size */
                        {
                            ofs = bcs; break;
                        }
                    }
                    else
#endif
                    clst = get_fat(fp->fs, clst);       /* Follow cluster chain if not in write mode */
                    if (clst == 0xFFFFFFFF)
                    {
                        ABORT(fp->fs, FR_DISK_ERR);
                    }
                    if (clst <= 1 || clst >= fp->fs->n_fatent)
                    {
                        ABORT(fp->fs, FR_INT_ERR);
                    }
                    fp->curr_clust = clst;
                    fp->fptr += bcs;
                    ofs -= bcs;
                }
                fp->fptr += ofs;
                if (ofs % SS(fp->fs))
                {
                    nsect = clust2sect(fp->fs, clst);   /* Current sector */
                    if (!nsect)
                    {
                        ABORT(fp->fs, FR_INT_ERR);
                    }
                    nsect += ofs / SS(fp->fs);
                }
            }
        }
        if (fp->fptr % SS(fp->fs) && nsect != fp->dsect)
        {
#if !_FS_TINY
#if !_FS_READONLY
            if (fp->flag & FA__DIRTY)           /* Flush dirty buffer if needed */
            {
                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
                fp->flag &= ~FA__DIRTY;
            }
#endif
            if (disk_read(fp->fs->drv, fp->buf, nsect, 1) != RES_OK)
            {
                ABORT(fp->fs, FR_DISK_ERR);
            }
#endif
            fp->dsect = nsect;
        }
#if !_FS_READONLY
        if (fp->fptr > fp->fsize)           /* Set change flag if the file size is extended */
        {
            fp->fsize = fp->fptr;
            fp->flag |= FA__WRITTEN;
        }
#endif
    }

    LEAVE_FF(fp->fs, res);
}



#if _FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Create a Directroy Object                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_opendir(
    DIR *dj,            /* Pointer to directory object to create */
    const TCHAR *path   /* Pointer to the directory path */
    )
{
    FRESULT res;

    DEF_NAMEBUF;


    res = chk_mounted(&path, &dj->fs, 0);
    if (res == FR_OK)
    {
        INIT_BUF(*dj);
        res = follow_path(dj, path);            /* Follow the path to the directory */
        FREE_BUF();
        if (res == FR_OK)                       /* Follow completed */
        {
            if (dj->dir)                        /* It is not the root dir */
            {
                if (dj->dir[DIR_Attr] & AM_DIR)     /* The object is a directory */
                {
                    dj->sclust = LD_CLUST(dj->dir);
                }
                else                            /* The object is not a directory */
                {
                    res = FR_NO_PATH;
                }
            }
            if (res == FR_OK)
            {
                dj->id = dj->fs->id;
                res = dir_sdi(dj, 0);           /* Rewind dir */
            }
        }
        if (res == FR_NO_FILE)
        {
            res = FR_NO_PATH;
        }
    }

    LEAVE_FF(dj->fs, res);
}




/*-----------------------------------------------------------------------*/
/* Read Directory Entry in Sequense                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_readdir(
    DIR *dj,            /* Pointer to the open directory object */
    FILINFO *fno        /* Pointer to file information to return */
    )
{
    FRESULT res;

    DEF_NAMEBUF;


    res = validate(dj->fs, dj->id);         /* Check validity of the object */
    if (res == FR_OK)
    {
        if (!fno)
        {
            res = dir_sdi(dj, 0);           /* Rewind the directory object */
        }
        else
        {
            INIT_BUF(*dj);
            res = dir_read(dj);             /* Read an directory item */
            if (res == FR_NO_FILE)          /* Reached end of dir */
            {
                dj->sect = 0;
                res = FR_OK;
            }
            if (res == FR_OK)               /* A valid entry is found */
            {
                get_fileinfo(dj, fno);      /* Get the object information */
                res = dir_next(dj, 0);      /* Increment index for next */
                if (res == FR_NO_FILE)
                {
                    dj->sect = 0;
                    res = FR_OK;
                }
            }
            FREE_BUF();
        }
    }

    LEAVE_FF(dj->fs, res);
}



#if _FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Get File Status                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_stat(
    const TCHAR *path,  /* Pointer to the file path */
    FILINFO *fno        /* Pointer to file information to return */
    )
{
    FRESULT res;
    DIR dj;

    DEF_NAMEBUF;


    res = chk_mounted(&path, &dj.fs, 0);
    if (res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);   /* Follow the file path */
        if (res == FR_OK)               /* Follow completed */
        {
            if (dj.dir)     /* Found an object */
            {
                get_fileinfo(&dj, fno);
            }
            else            /* It is root dir */
            {
                res = FR_INVALID_NAME;
            }
        }
        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}



#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Get Number of Free Clusters                                           */
/*-----------------------------------------------------------------------*/

FRESULT f_getfree(
    const TCHAR *path,  /* Pointer to the logical drive number (root dir) */
    DWORD *nclst,       /* Pointer to the variable to return number of free clusters */
    FATFS **fatfs       /* Pointer to pointer to corresponding file system object to return */
    )
{
    FRESULT res;
    DWORD n, clst, sect, stat;
    UINT i;
    BYTE fat, *p;


    /* Get drive number */
    res = chk_mounted(&path, fatfs, 0);
    if (res == FR_OK)
    {
        /* If free_clust is valid, return it without full cluster scan */
        if ((*fatfs)->free_clust <= (*fatfs)->n_fatent - 2)
        {
            *nclst = (*fatfs)->free_clust;
        }
        else
        {
            /* Get number of free clusters */
            fat = (*fatfs)->fs_type;
            n = 0;
            if (fat == FS_FAT12)
            {
                clst = 2;
                do
                {
                    stat = get_fat(*fatfs, clst);
                    if (stat == 0xFFFFFFFF)
                    {
                        res = FR_DISK_ERR; break;
                    }
                    if (stat == 1)
                    {
                        res = FR_INT_ERR; break;
                    }
                    if (stat == 0)
                    {
                        n++;
                    }
                }
                while (++clst < (*fatfs)->n_fatent);
            }
            else
            {
                clst = (*fatfs)->n_fatent;
                sect = (*fatfs)->fatbase;
                i = 0; p = 0;
                do
                {
                    if (!i)
                    {
                        res = move_window(*fatfs, sect++);
                        if (res != FR_OK)
                        {
                            break;
                        }
                        p = (*fatfs)->win;
                        i = SS(*fatfs);
                    }
                    if (fat == FS_FAT16)
                    {
                        if (LD_WORD(p) == 0)
                        {
                            n++;
                        }
                        p += 2; i -= 2;
                    }
                    else
                    {
                        if ((LD_DWORD(p) & 0x0FFFFFFF) == 0)
                        {
                            n++;
                        }
                        p += 4; i -= 4;
                    }
                }
                while (--clst);
            }
            (*fatfs)->free_clust = n;
            if (fat == FS_FAT32)
            {
                (*fatfs)->fsi_flag = 1;
            }
            *nclst = n;
        }
    }
    LEAVE_FF(*fatfs, res);
}




/*-----------------------------------------------------------------------*/
/* Truncate File                                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_truncate(
    FIL *fp     /* Pointer to the file object */
    )
{
    FRESULT res;
    DWORD ncl;


    res = validate(fp->fs, fp->id);     /* Check validity of the object */
    if (res == FR_OK)
    {
        if (fp->flag & FA__ERROR)           /* Check abort flag */
        {
            res = FR_INT_ERR;
        }
        else
        {
            if (!(fp->flag & FA_WRITE))     /* Check access mode */
            {
                res = FR_DENIED;
            }
        }
    }
    if (res == FR_OK)
    {
        if (fp->fsize > fp->fptr)
        {
            fp->fsize = fp->fptr;   /* Set file size to current R/W point */
            fp->flag |= FA__WRITTEN;
            if (fp->fptr == 0)      /* When set file size to zero, remove entire cluster chain */
            {
                res = remove_chain(fp->fs, fp->org_clust);
                fp->org_clust = 0;
            }
            else                    /* When truncate a part of the file, remove remaining clusters */
            {
                ncl = get_fat(fp->fs, fp->curr_clust);
                res = FR_OK;
                if (ncl == 0xFFFFFFFF)
                {
                    res = FR_DISK_ERR;
                }
                if (ncl == 1)
                {
                    res = FR_INT_ERR;
                }
                if (res == FR_OK && ncl < fp->fs->n_fatent)
                {
                    res = put_fat(fp->fs, fp->curr_clust, 0x0FFFFFFF);
                    if (res == FR_OK)
                    {
                        res = remove_chain(fp->fs, ncl);
                    }
                }
            }
        }
        if (res != FR_OK)
        {
            fp->flag |= FA__ERROR;
        }
    }

    LEAVE_FF(fp->fs, res);
}




/*-----------------------------------------------------------------------*/
/* Delete a File or Directory                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_unlink(
    const TCHAR *path       /* Pointer to the file or directory path */
    )
{
    FRESULT res;
    DIR dj, sdj;
    BYTE *dir;
    DWORD dclst;

    DEF_NAMEBUF;


    res = chk_mounted(&path, &dj.fs, 1);
    if (res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);       /* Follow the file path */
        if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
        {
            res = FR_INVALID_NAME;          /* Cannot remove dot entry */
        }
#if _FS_SHARE
        if (res == FR_OK)
        {
            res = chk_lock(&dj, 2);                 /* Cannot remove open file */
        }
#endif
        if (res == FR_OK)                   /* The object is accessible */
        {
            dir = dj.dir;
            if (!dir)
            {
                res = FR_INVALID_NAME;      /* Cannot remove the start directory */
            }
            else
            {
                if (dir[DIR_Attr] & AM_RDO)
                {
                    res = FR_DENIED;        /* Cannot remove R/O object */
                }
            }
            dclst = LD_CLUST(dir);
            if (res == FR_OK && (dir[DIR_Attr] & AM_DIR))   /* Is it a sub-dir? */
            {
                if (dclst < 2)
                {
                    res = FR_INT_ERR;
                }
                else
                {
                    mem_cpy(&sdj, &dj, sizeof(DIR));    /* Check if the sub-dir is empty or not */
                    sdj.sclust = dclst;
                    res = dir_sdi(&sdj, 2);     /* Exclude dot entries */
                    if (res == FR_OK)
                    {
                        res = dir_read(&sdj);
                        if (res == FR_OK            /* Not empty dir */
#if _FS_RPATH
                            || dclst == sdj.fs->cdir /* Current dir */
#endif
                            )
                        {
                            res = FR_DENIED;
                        }
                        if (res == FR_NO_FILE)
                        {
                            res = FR_OK;                    /* Empty */
                        }
                    }
                }
            }
            if (res == FR_OK)
            {
                res = dir_remove(&dj);      /* Remove the directory entry */
                if (res == FR_OK)
                {
                    if (dclst)              /* Remove the cluster chain if exist */
                    {
                        res = remove_chain(dj.fs, dclst);
                    }
                    if (res == FR_OK)
                    {
                        res = sync(dj.fs);
                    }
                }
            }
        }
        FREE_BUF();
    }
    LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Create a Directory                                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_mkdir(
    const TCHAR *path       /* Pointer to the directory path */
    )
{
    FRESULT res;
    DIR dj;
    BYTE *dir, n;
    DWORD dsc, dcl, pcl, tim = get_fattime();

    DEF_NAMEBUF;


    res = chk_mounted(&path, &dj.fs, 1);
    if (res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);           /* Follow the file path */
        if (res == FR_OK)
        {
            res = FR_EXIST;                     /* Any object with same name is already existing */
        }
        if (_FS_RPATH && res == FR_NO_FILE && (dj.fn[NS] & NS_DOT))
        {
            res = FR_INVALID_NAME;
        }
        if (res == FR_NO_FILE)                  /* Can create a new directory */
        {
            dcl = create_chain(dj.fs, 0);       /* Allocate a cluster for the new directory table */
            res = FR_OK;
            if (dcl == 0)
            {
                res = FR_DENIED;                /* No space to allocate a new cluster */
            }
            if (dcl == 1)
            {
                res = FR_INT_ERR;
            }
            if (dcl == 0xFFFFFFFF)
            {
                res = FR_DISK_ERR;
            }
            if (res == FR_OK)                   /* Flush FAT */
            {
                res = move_window(dj.fs, 0);
            }
            if (res == FR_OK)                   /* Initialize the new directory table */
            {
                dsc = clust2sect(dj.fs, dcl);
                dir = dj.fs->win;
                mem_set(dir, 0, SS(dj.fs));
                mem_set(dir + DIR_Name, ' ', 8 + 3);    /* Create "." entry */
                dir[DIR_Name] = '.';
                dir[DIR_Attr] = AM_DIR;
                ST_DWORD(dir + DIR_WrtTime, tim);
                ST_CLUST(dir, dcl);
                mem_cpy(dir + 32, dir, 32);           /* Create ".." entry */
                dir[33] = '.'; pcl = dj.sclust;
                if (dj.fs->fs_type == FS_FAT32 && pcl == dj.fs->dirbase)
                {
                    pcl = 0;
                }
                ST_CLUST(dir + 32, pcl);
                for (n = dj.fs->csize; n; n--)      /* Write dot entries and clear following sectors */
                {
                    dj.fs->winsect = dsc++;
                    dj.fs->wflag = 1;
                    res = move_window(dj.fs, 0);
                    if (res != FR_OK)
                    {
                        break;
                    }
                    mem_set(dir, 0, SS(dj.fs));
                }
            }
            if (res == FR_OK)
            {
                res = dir_register(&dj);                /* Register the object to the directoy */
            }
            if (res != FR_OK)
            {
                remove_chain(dj.fs, dcl);           /* Could not register, remove cluster chain */
            }
            else
            {
                dir = dj.dir;
                dir[DIR_Attr] = AM_DIR;             /* Attribute */
                ST_DWORD(dir + DIR_WrtTime, tim);     /* Created time */
                ST_CLUST(dir, dcl);                 /* Table start cluster */
                dj.fs->wflag = 1;
                res = sync(dj.fs);
            }
        }
        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Change Attribute                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_chmod(
    const TCHAR *path,  /* Pointer to the file path */
    BYTE value,         /* Attribute bits */
    BYTE mask           /* Attribute mask to change */
    )
{
    FRESULT res;
    DIR dj;
    BYTE *dir;

    DEF_NAMEBUF;


    res = chk_mounted(&path, &dj.fs, 1);
    if (res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);       /* Follow the file path */
        FREE_BUF();
        if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
        {
            res = FR_INVALID_NAME;
        }
        if (res == FR_OK)
        {
            dir = dj.dir;
            if (!dir)                       /* Is it a root directory? */
            {
                res = FR_INVALID_NAME;
            }
            else                            /* File or sub directory */
            {
                mask &= AM_RDO | AM_HID | AM_SYS | AM_ARC;    /* Valid attribute mask */
                dir[DIR_Attr] = (value & mask) | (dir[DIR_Attr] & (BYTE) ~mask); /* Apply attribute change */
                dj.fs->wflag = 1;
                res = sync(dj.fs);
            }
        }
    }

    LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Change Timestamp                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_utime(
    const TCHAR *path,  /* Pointer to the file/directory name */
    const FILINFO *fno  /* Pointer to the time stamp to be set */
    )
{
    FRESULT res;
    DIR dj;
    BYTE *dir;

    DEF_NAMEBUF;


    res = chk_mounted(&path, &dj.fs, 1);
    if (res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);   /* Follow the file path */
        FREE_BUF();
        if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
        {
            res = FR_INVALID_NAME;
        }
        if (res == FR_OK)
        {
            dir = dj.dir;
            if (!dir)                   /* Root directory */
            {
                res = FR_INVALID_NAME;
            }
            else                        /* File or sub-directory */
            {
                ST_WORD(dir + DIR_WrtTime, fno->ftime);
                ST_WORD(dir + DIR_WrtDate, fno->fdate);
                dj.fs->wflag = 1;
                res = sync(dj.fs);
            }
        }
    }

    LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Rename File/Directory                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_rename(
    const TCHAR *path_old,  /* Pointer to the old name */
    const TCHAR *path_new   /* Pointer to the new name */
    )
{
    FRESULT res;
    DIR djo, djn;
    BYTE buf[21], *dir;
    DWORD dw;

    DEF_NAMEBUF;


    res = chk_mounted(&path_old, &djo.fs, 1);
    if (res == FR_OK)
    {
        djn.fs = djo.fs;
        INIT_BUF(djo);
        res = follow_path(&djo, path_old);      /* Check old object */
        if (_FS_RPATH && res == FR_OK && (djo.fn[NS] & NS_DOT))
        {
            res = FR_INVALID_NAME;
        }
#if _FS_SHARE
        if (res == FR_OK)
        {
            res = chk_lock(&djo, 2);
        }
#endif
        if (res == FR_OK)                       /* Old object is found */
        {
            if (!djo.dir)                       /* Is root dir? */
            {
                res = FR_NO_FILE;
            }
            else
            {
                mem_cpy(buf, djo.dir + DIR_Attr, 21);     /* Save the object information except for name */
                mem_cpy(&djn, &djo, sizeof(DIR));       /* Check new object */
                res = follow_path(&djn, path_new);
                if (res == FR_OK)
                {
                    res = FR_EXIST;                     /* The new object name is already existing */
                }
                if (res == FR_NO_FILE)                  /* Is it a valid path and no name collision? */
                { /* Start critical section that any interruption or error can cause cross-link */
                    res = dir_register(&djn);           /* Register the new entry */
                    if (res == FR_OK)
                    {
                        dir = djn.dir;                  /* Copy object information except for name */
                        mem_cpy(dir + 13, buf + 2, 19);
                        dir[DIR_Attr] = buf[0] | AM_ARC;
                        djo.fs->wflag = 1;
                        if (djo.sclust != djn.sclust && (dir[DIR_Attr] & AM_DIR))       /* Update .. entry in the directory if needed */
                        {
                            dw = clust2sect(djn.fs, LD_CLUST(dir));
                            if (!dw)
                            {
                                res = FR_INT_ERR;
                            }
                            else
                            {
                                res = move_window(djn.fs, dw);
                                dir = djn.fs->win + 32;   /* .. entry */
                                if (res == FR_OK && dir[1] == '.')
                                {
                                    dw = (djn.fs->fs_type == FS_FAT32 && djn.sclust == djn.fs->dirbase) ? 0 : djn.sclust;
                                    ST_CLUST(dir, dw);
                                    djn.fs->wflag = 1;
                                }
                            }
                        }
                        if (res == FR_OK)
                        {
                            res = dir_remove(&djo);     /* Remove old entry */
                            if (res == FR_OK)
                            {
                                res = sync(djo.fs);
                            }
                        }
                    }
/* End critical section */
                }
            }
        }
        FREE_BUF();
    }
    LEAVE_FF(djo.fs, res);
}

#endif /* !_FS_READONLY */
#endif /* _FS_MINIMIZE == 0 */
#endif /* _FS_MINIMIZE <= 1 */
#endif /* _FS_MINIMIZE <= 2 */



/*-----------------------------------------------------------------------*/
/* Forward data to the stream directly (available on only tiny cfg)      */
/*-----------------------------------------------------------------------*/
#if _USE_FORWARD && _FS_TINY

FRESULT f_forward(
    FIL *fp,                        /* Pointer to the file object */
    UINT (*func)(const BYTE*, UINT), /* Pointer to the streaming function */
    UINT btr,                       /* Number of bytes to forward */
    UINT *bf                        /* Pointer to number of bytes forwarded */
    )
{
    FRESULT res;
    DWORD remain, clst, sect;
    UINT rcnt;
    BYTE csect;


    *bf = 0;    /* Initialize byte counter */

    res = validate(fp->fs, fp->id);                 /* Check validity of the object */
    if (res != FR_OK)
    {
        LEAVE_FF(fp->fs, res);
    }
    if (fp->flag & FA__ERROR)                       /* Check error flag */
    {
        LEAVE_FF(fp->fs, FR_INT_ERR);
    }
    if (!(fp->flag & FA_READ))                      /* Check access mode */
    {
        LEAVE_FF(fp->fs, FR_DENIED);
    }

    remain = fp->fsize - fp->fptr;
    if (btr > remain)
    {
        btr = (UINT)remain;                         /* Truncate btr by remaining bytes */

    }
    for (; btr && (*func)(0, 0);                    /* Repeat until all data transferred or stream becomes busy */
         fp->fptr += rcnt, *bf += rcnt, btr -= rcnt)
    {
        csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
        if ((fp->fptr % SS(fp->fs)) == 0)           /* On the sector boundary? */
        {
            if (!csect)                             /* On the cluster boundary? */
            {
                clst = (fp->fptr == 0) ?            /* On the top of the file? */
                       fp->org_clust : get_fat(fp->fs, fp->curr_clust);
                if (clst <= 1)
                {
                    ABORT(fp->fs, FR_INT_ERR);
                }
                if (clst == 0xFFFFFFFF)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
                fp->curr_clust = clst;              /* Update current cluster */
            }
        }
        sect = clust2sect(fp->fs, fp->curr_clust);  /* Get current data sector */
        if (!sect)
        {
            ABORT(fp->fs, FR_INT_ERR);
        }
        sect += csect;
        if (move_window(fp->fs, sect))              /* Move sector window */
        {
            ABORT(fp->fs, FR_DISK_ERR);
        }
        fp->dsect = sect;
        rcnt = SS(fp->fs) - (WORD)(fp->fptr % SS(fp->fs));  /* Forward data from sector window */
        if (rcnt > btr)
        {
            rcnt = btr;
        }
        rcnt = (*func)(&fp->fs->win[(WORD)fp->fptr % SS(fp->fs)], rcnt);
        if (!rcnt)
        {
            ABORT(fp->fs, FR_INT_ERR);
        }
    }

    LEAVE_FF(fp->fs, FR_OK);
}
#endif /* _USE_FORWARD */



#if _USE_MKFS && !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Create File System on the Drive                                       */
/*-----------------------------------------------------------------------*/
#define N_ROOTDIR   512     /* Multiple of 32 */
#define N_FATS      1       /* 1 or 2 */


FRESULT f_mkfs(
    BYTE drv,       /* Logical drive number */
    BYTE sfd,       /* Partitioning rule 0:FDISK, 1:SFD */
    UINT au         /* Allocation unit size [bytes] */
    )
{
    static const WORD vst[] = { 1024,   512,  256,  128,   64,    32,   16,    8,    4,    2,   0 };
    static const WORD cst[] = { 32768, 16384, 8192, 4096, 2048, 16384, 8192, 4096, 2048, 1024, 512 };
    BYTE fmt, md, *tbl;
    DWORD n_clst, vs, n, wsect;
    UINT i;
    DWORD b_vol, b_fat, b_dir, b_data;  /* Offset (LBA) */
    DWORD n_vol, n_rsv, n_fat, n_dir;   /* Size */
    FATFS *fs;
    DSTATUS stat;


    /* Check mounted drive and clear work area */
    if (drv >= _VOLUMES)
    {
        return FR_INVALID_DRIVE;
    }
    fs = FatFs[drv];
    if (!fs)
    {
        return FR_NOT_ENABLED;
    }
    fs->fs_type = 0;
    drv = LD2PD(drv);

    /* Get disk statics */
    stat = disk_initialize(drv);
    if (stat & STA_NOINIT)
    {
        return FR_NOT_READY;
    }
    if (stat & STA_PROTECT)
    {
        return FR_WRITE_PROTECTED;
    }
#if _MAX_SS != 512                  /* Get disk sector size */
    if (disk_ioctl(drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK)
    {
        return FR_DISK_ERR;
    }
#endif
    if (disk_ioctl(drv, GET_SECTOR_COUNT, &n_vol) != RES_OK || n_vol < 128)
    {
        return FR_DISK_ERR;
    }
    b_vol = (sfd) ? 0 : 63; /* Volume start sector */
    n_vol -= b_vol;
    if (au & (au - 1))
    {
        au = 0;                     /* Check validity of the allocation unit size */
    }
    if (!au)                        /* AU auto selection */
    {
        vs = n_vol / (2000 / (SS(fs) / 512));
        for (i = 0; vs < vst[i]; i++)
        {
            ;
        }
        au = cst[i];
    }
    au /= SS(fs);       /* Number of sectors per cluster */
    if (au == 0)
    {
        au = 1;
    }
    if (au > 128)
    {
        au = 128;
    }

    /* Pre-compute number of clusters and FAT syb-type */
    n_clst = n_vol / au;
    fmt = FS_FAT12;
    if (n_clst >= MIN_FAT16)
    {
        fmt = FS_FAT16;
    }
    if (n_clst >= MIN_FAT32)
    {
        fmt = FS_FAT32;
    }

    /* Determine offset and size of FAT structure */
    if (fmt == FS_FAT32)
    {
        n_fat = ((n_clst * 4) + 8 + SS(fs) - 1) / SS(fs);
        n_rsv = 32;
        n_dir = 0;
    }
    else
    {
        n_fat = (fmt == FS_FAT12) ? (n_clst * 3 + 1) / 2 + 3 : (n_clst * 2) + 4;
        n_fat = (n_fat + SS(fs) - 1) / SS(fs);
        n_rsv = 1;
        n_dir = N_ROOTDIR * 32UL / SS(fs);
    }
    b_fat = b_vol + n_rsv;              /* FAT area start sector */
    b_dir = b_fat + n_fat * N_FATS;     /* Directory area start sector */
    b_data = b_dir + n_dir;             /* Data area start sector */
    if (n_vol < b_data + au)
    {
        return FR_MKFS_ABORTED;                         /* Too small volume */

    }
    /* Align data start sector to erase block boundary (for flash memory media) */
    if (disk_ioctl(drv, GET_BLOCK_SIZE, &n) != RES_OK || !n || n > 32768)
    {
        n = 1;
    }
    n = (b_data + n - 1) & ~(n - 1);    /* Next nearest erase block from current data start */
    n = (n - b_data) / N_FATS;
    if (fmt == FS_FAT32)        /* FAT32: Move FAT offset */
    {
        n_rsv += n;
        b_fat += n;
    }
    else                        /* FAT12/16: Expand FAT size */
    {
        n_fat += n;
    }

    /* Determine number of cluster and final check of validity of the FAT sub-type */
    n_clst = (n_vol - n_rsv - n_fat * N_FATS - n_dir) / au;
    if (   (fmt == FS_FAT16 && n_clst < MIN_FAT16)
           || (fmt == FS_FAT32 && n_clst < MIN_FAT32))
    {
        return FR_MKFS_ABORTED;
    }

    /* Create partition table if required */
    if (sfd)
    {
        md = 0xF0;
    }
    else
    {
        DWORD n_disk = b_vol + n_vol;

        mem_set(fs->win, 0, SS(fs));
        tbl = fs->win + MBR_Table;
        ST_DWORD(tbl, 0x00010180);          /* Partition start in CHS */
        if (n_disk < 63UL * 255 * 1024)     /* Partition end in CHS */
        {
            n_disk = n_disk / 63 / 255;
            tbl[7] = (BYTE)n_disk;
            tbl[6] = (BYTE)((n_disk >> 2) | 63);
        }
        else
        {
            ST_WORD(&tbl[6], 0xFFFF);
        }
        tbl[5] = 254;
        if (fmt != FS_FAT32)                /* System ID */
        {
            tbl[4] = (n_vol < 0x10000) ? 0x04 : 0x06;
        }
        else
        {
            tbl[4] = 0x0c;
        }
        ST_DWORD(tbl + 8, 63);                /* Partition start in LBA */
        ST_DWORD(tbl + 12, n_vol);            /* Partition size in LBA */
        ST_WORD(tbl + 64, 0xAA55);            /* Signature */
        if (disk_write(drv, fs->win, 0, 1) != RES_OK)
        {
            return FR_DISK_ERR;
        }
        md = 0xF8;
    }

    /* Create volume boot record */
    tbl = fs->win;                          /* Clear sector */
    mem_set(tbl, 0, SS(fs));
    mem_cpy(tbl, "\xEB\xFE\x90" "MSDOS5.0", 11); /* Boot code, OEM name */
    i = SS(fs);                             /* Sector size */
    ST_WORD(tbl + BPB_BytsPerSec, i);
    tbl[BPB_SecPerClus] = (BYTE)au;         /* Sectors per cluster */
    ST_WORD(tbl + BPB_RsvdSecCnt, n_rsv);     /* Reserved sectors */
    tbl[BPB_NumFATs] = N_FATS;              /* Number of FATs */
    i = (fmt == FS_FAT32) ? 0 : N_ROOTDIR;  /* Number of rootdir entries */
    ST_WORD(tbl + BPB_RootEntCnt, i);
    if (n_vol < 0x10000)                    /* Number of total sectors */
    {
        ST_WORD(tbl + BPB_TotSec16, n_vol);
    }
    else
    {
        ST_DWORD(tbl + BPB_TotSec32, n_vol);
    }
    tbl[BPB_Media] = md;                    /* Media descriptor */
    ST_WORD(tbl + BPB_SecPerTrk, 63);         /* Number of sectors per track */
    ST_WORD(tbl + BPB_NumHeads, 255);         /* Number of heads */
    ST_DWORD(tbl + BPB_HiddSec, b_vol);       /* Hidden sectors */
    n = get_fattime();                      /* Use current time as VSN */
    if (fmt == FS_FAT32)
    {
        ST_DWORD(tbl + BS_VolID32, n);        /* VSN */
        ST_DWORD(tbl + BPB_FATSz32, n_fat);   /* Number of sectors per FAT */
        ST_DWORD(tbl + BPB_RootClus, 2);      /* Root directory start cluster (2) */
        ST_WORD(tbl + BPB_FSInfo, 1);         /* FSInfo record offset (VBR+1) */
        ST_WORD(tbl + BPB_BkBootSec, 6);      /* Backup boot record offset (VBR+6) */
        tbl[BS_DrvNum32] = 0x80;            /* Drive number */
        tbl[BS_BootSig32] = 0x29;           /* Extended boot signature */
        mem_cpy(tbl + BS_VolLab32, "NO NAME    " "FAT32   ", 19); /* Volume label, FAT signature */
    }
    else
    {
        ST_DWORD(tbl + BS_VolID, n);          /* VSN */
        ST_WORD(tbl + BPB_FATSz16, n_fat);    /* Number of sectors per FAT */
        tbl[BS_DrvNum] = 0x80;              /* Drive number */
        tbl[BS_BootSig] = 0x29;             /* Extended boot signature */
        mem_cpy(tbl + BS_VolLab, "NO NAME    " "FAT     ", 19);   /* Volume label, FAT signature */
    }
    ST_WORD(tbl + BS_55AA, 0xAA55);           /* Signature (Offset is fixed here regardless of sector size) */
    if (disk_write(drv, tbl, b_vol, 1) != RES_OK) /* Write original (VBR) */
    {
        return FR_DISK_ERR;
    }
    if (fmt == FS_FAT32)                    /* Write backup (VBR+6) */
    {
        disk_write(drv, tbl, b_vol + 6, 1);
    }

    /* Initialize FAT area */
    wsect = b_fat;
    for (i = 0; i < N_FATS; i++)
    {
        mem_set(tbl, 0, SS(fs));            /* 1st sector of the FAT  */
        n = md;                             /* Media descriptor byte */
        if (fmt != FS_FAT32)
        {
            n |= (fmt == FS_FAT12) ? 0x00FFFF00 : 0xFFFFFF00;
            ST_DWORD(tbl + 0, n);             /* Reserve cluster #0-1 (FAT12/16) */
        }
        else
        {
            n |= 0xFFFFFF00;
            ST_DWORD(tbl + 0, n);             /* Reserve cluster #0-1 (FAT32) */
            ST_DWORD(tbl + 4, 0xFFFFFFFF);
            ST_DWORD(tbl + 8, 0x0FFFFFFF);    /* Reserve cluster #2 for root dir */
        }
        if (disk_write(drv, tbl, wsect++, 1) != RES_OK)
        {
            return FR_DISK_ERR;
        }
        mem_set(tbl, 0, SS(fs));            /* Fill following FAT entries with zero */
        for (n = 1; n < n_fat; n++)         /* This loop may take a time on FAT32 volume due to many single sector write */
        {
            if (disk_write(drv, tbl, wsect++, 1) != RES_OK)
            {
                return FR_DISK_ERR;
            }
        }
    }

    /* Initialize root directory */
    i = (fmt == FS_FAT32) ? au : n_dir;
    do
    {
        if (disk_write(drv, tbl, wsect++, 1) != RES_OK)
        {
            return FR_DISK_ERR;
        }
    }
    while (--i);

#if _USE_ERASE  /* Erase data area if needed */
    {
        DWORD eb[2];

        eb[0] = wsect; eb[1] = wsect + n_clst * au - 1;
        disk_ioctl(drv, CTRL_ERASE_SECTOR, eb);
    }
#endif

    /* Create FSInfo if needed */
    if (fmt == FS_FAT32)
    {
        ST_WORD(tbl + BS_55AA, 0xAA55);
        ST_DWORD(tbl + FSI_LeadSig, 0x41615252);
        ST_DWORD(tbl + FSI_StrucSig, 0x61417272);
        ST_DWORD(tbl + FSI_Free_Count, n_clst - 1);
        ST_DWORD(tbl + FSI_Nxt_Free, 0xFFFFFFFF);
        disk_write(drv, tbl, b_vol + 1, 1); /* Write original (VBR+1) */
        disk_write(drv, tbl, b_vol + 7, 1); /* Write backup (VBR+7) */
    }

    return (disk_ioctl(drv, CTRL_SYNC, (void*)0) == RES_OK) ? FR_OK : FR_DISK_ERR;
}

#endif /* _USE_MKFS && !_FS_READONLY */




#if _USE_STRFUNC
/*-----------------------------------------------------------------------*/
/* Get a string from the file                                            */
/*-----------------------------------------------------------------------*/
TCHAR* f_gets(
    TCHAR* buff,    /* Pointer to the string buffer to read */
    int len,        /* Size of string buffer (characters) */
    FIL* fil        /* Pointer to the file object */
    )
{
    int n = 0;
    TCHAR c, *p = buff;
    BYTE s[2];
    UINT rc;


    while (n < len - 1)             /* Read bytes until buffer gets filled */
    {
        f_read(fil, s, 1, &rc);
        if (rc != 1)
        {
            break;                  /* Break on EOF or error */
        }
        c = s[0];
#if _LFN_UNICODE                    /* Read a character in UTF-8 encoding */
        if (c >= 0x80)
        {
            if (c < 0xC0)
            {
                continue;           /* Skip stray trailer */
            }
            if (c < 0xE0)           /* Two-byte sequense */
            {
                f_read(fil, s, 1, &rc);
                if (rc != 1)
                {
                    break;
                }
                c = ((c & 0x1F) << 6) | (s[0] & 0x3F);
                if (c < 0x80)
                {
                    c = '?';
                }
            }
            else
            {
                if (c < 0xF0)       /* Three-byte sequense */
                {
                    f_read(fil, s, 2, &rc);
                    if (rc != 2)
                    {
                        break;
                    }
                    c = (c << 12) | ((s[0] & 0x3F) << 6) | (s[1] & 0x3F);
                    if (c < 0x800)
                    {
                        c = '?';
                    }
                }
                else                /* Reject four-byte sequense */
                {
                    c = '?';
                }
            }
        }
#endif
#if _USE_STRFUNC >= 2
        if (c == '\r')
        {
            continue;               /* Strip '\r' */
        }
#endif
        *p++ = c;
        n++;
        if (c == '\n')
        {
            break;                  /* Break on EOL */
        }
    }
    *p = 0;
    return n ? buff : 0;            /* When no data read (eof or error), return with error. */
}



#if !_FS_READONLY
#include <stdarg.h>
/*-----------------------------------------------------------------------*/
/* Put a character to the file                                           */
/*-----------------------------------------------------------------------*/
int f_putc(
    TCHAR c,    /* A character to be output */
    FIL* fil    /* Pointer to the file object */
    )
{
    UINT bw, btw;
    BYTE s[3];


#if _USE_STRFUNC >= 2
    if (c == '\n')
    {
        f_putc('\r', fil);              /* LF -> CRLF conversion */
    }
#endif

#if _LFN_UNICODE    /* Write the character in UTF-8 encoding */
    if (c < 0x80)           /* 7-bit */
    {
        s[0] = (BYTE)c;
        btw = 1;
    }
    else
    {
        if (c < 0x800)      /* 11-bit */
        {
            s[0] = (BYTE)(0xC0 | (c >> 6));
            s[1] = (BYTE)(0x80 | (c & 0x3F));
            btw = 2;
        }
        else                /* 16-bit */
        {
            s[0] = (BYTE)(0xE0 | (c >> 12));
            s[1] = (BYTE)(0x80 | ((c >> 6) & 0x3F));
            s[2] = (BYTE)(0x80 | (c & 0x3F));
            btw = 3;
        }
    }
#else               /* Write the character without conversion */
    s[0] = (BYTE)c;
    btw = 1;
#endif
    f_write(fil, s, btw, &bw);      /* Write the char to the file */
    return (bw == btw) ? 1 : EOF;   /* Return the result */
}




/*-----------------------------------------------------------------------*/
/* Put a string to the file                                              */
/*-----------------------------------------------------------------------*/
int f_puts(
    const TCHAR* str,   /* Pointer to the string to be output */
    FIL* fil            /* Pointer to the file object */
    )
{
    int n;


    for (n = 0; *str; str++, n++)
    {
        if (f_putc(*str, fil) == EOF)
        {
            return EOF;
        }
    }
    return n;
}




/*-----------------------------------------------------------------------*/
/* Put a formatted string to the file                                    */
/*-----------------------------------------------------------------------*/
int f_printf(
    FIL* fil,           /* Pointer to the file object */
    const TCHAR* str,   /* Pointer to the format string */
    ...                 /* Optional arguments... */
    )
{
    va_list arp;
    BYTE f, r;
    UINT i, w;
    ULONG val;
    TCHAR c, d, s[16];
    int res, cc;


    va_start(arp, str);

    for (cc = res = 0; cc != EOF; res += cc)
    {
        c = *str++;
        if (c == 0)
        {
            break;                  /* End of string */
        }
        if (c != '%')               /* Non escape character */
        {
            cc = f_putc(c, fil);
            if (cc != EOF)
            {
                cc = 1;
            }
            continue;
        }
        w = f = 0;
        c = *str++;
        if (c == '0')               /* Flag: '0' padding */
        {
            f = 1; c = *str++;
        }
        while (IsDigit(c))          /* Precision */
        {
            w = w * 10 + c - '0';
            c = *str++;
        }
        if (c == 'l' || c == 'L')   /* Prefix: Size is long int */
        {
            f |= 2; c = *str++;
        }
        if (!c)
        {
            break;
        }
        d = c;
        if (IsLower(d))
        {
            d -= 0x20;
        }
        switch (d)                  /* Type is... */
        {
        case 'S':                   /* String */
            cc = f_puts(va_arg(arp, TCHAR*), fil); continue;
        case 'C':                   /* Character */
            cc = f_putc((TCHAR)va_arg(arp, int), fil); continue;
        case 'B':                   /* Binary */
            r = 2; break;
        case 'O':                   /* Octal */
            r = 8; break;
        case 'D':                   /* Signed decimal */
        case 'U':                   /* Unsigned decimal */
            r = 10; break;
        case 'X':                   /* Hexdecimal */
            r = 16; break;
        default:                    /* Unknown */
            cc = f_putc(c, fil); continue;
        }

        /* Get an argument */
        val = (f & 2) ? va_arg(arp, long) : ((d == 'D') ? (long)va_arg(arp, int) : va_arg(arp, unsigned int));
        if (d == 'D' && (val & 0x80000000))
        {
            val = 0 - val;
            f |= 4;
        }
        /* Put it in numeral string */
        i = 0;
        do
        {
            d = (TCHAR)(val % r); val /= r;
            if (d > 9)
            {
                d += 7;
                if (c == 'x')
                {
                    d += 0x20;
                }
            }
            s[i++] = d + '0';
        }
        while (val && i < sizeof(s) / sizeof(s[0]));
        if (f & 4)
        {
            s[i++] = '-';
        }
        cc = 0;
        while (i < w-- && cc != EOF)
        {
            cc = f_putc((TCHAR)((f & 1) ? '0' : ' '), fil);
            res++;
        }
        do
        {
            cc = f_putc(s[--i], fil);
            res++;
        }
        while (i && cc != EOF);
        if (cc != EOF)
        {
            cc = 0;
        }
    }

    va_end(arp);
    return (cc == EOF) ? cc : res;
}

#endif /* !_FS_READONLY */
#endif /* _USE_STRFUNC */
